ME WAR · Intel Brief
Unclassified · OSINT
▮Daily Brief · Day 221 · Tue 2026-10-06

Day 221 brief — Gulf exports return to pre-war parity, Turkey and Pakistan commit forces to Saudi Arabia, and Mocha changes hands again

Direction
escalating
7-day risk
extreme
Spillover
critical
Ceasefire · 30d
7%
§01Escalation gauge6 clocks · overall assessment
Negotiation capacity
↘ worsening
deteriorating
Active deadline
↘ worsening
approaching
Interceptor reconstitution
↘ worsening
critical
Energy infrastructure
↗ improving
critical
Humanitarian escalation
↘ worsening
critical
Coalition cohesion
→ unchanged
strained
Overall read
How the six gauges compose into today’s posture.
276 words
⭐ The chokepoint stopped choking. Kpler put Middle East Gulf crude exports at 16.5 million barrels a day over 1-28 September, level with the pre-war average and up from 6.0 million in March, with 40% now moving through Saudi and Emirati pipelines and Hormuz's share of regional exports down from 83% to 60%. Hegseth gave the American version at Quantico: "Iran wants to play games with things like the Strait of Hormuz. They don't control it. We do." Trump rejected Iran's reopening terms outright; Pezeshkian called negotiations "meaningless" because "they have attacked us three times after talks". Saudi Arabia, Turkey and Pakistan then activated the Mecca Joint Defence Agreement, the two committing after an emergency meeting in Riyadh to "provide military forces and capabilities and ensure their rapid deployment in Saudi Arabia" — no numbers, no dates. On the ground Yemeni government forces claimed Mocha and Dhubab back and cut the supply roads to Bab al-Mandeb behind 100 coalition fighter jets, though Al Jazeera could not verify the battlefield reports. The Houthis widened the target set to King Khalid International Airport and the Rabigh refinery, warned every airline out of Saudi airspace but Mecca and Medina, and struck the East-West pipeline's Khurais pumping station; Aramco's chief executive called the supply cushion "scarily thin". Three tankers were hit in Hormuz over the weekend while CENTCOM disclosed 13 vessels destroyed in twelve weeks against Fars's claim of 13 tankers targeted in seven days. An AP investigation found the Port Shuaiba drone warnings were on the table before the strike that killed six Americans. Direction holds escalating; seven-day risk extreme; spillover critical; the thirty-day probability eases 8 → 7.
Negotiation capacity
Channels deteriorating — last communiqués disowned.
Active deadline
A named deadline is visibly approaching on the wire.
Interceptor reconstitution
Interceptor starvation forcing target-prioritization decisions.
Energy infrastructure
Energy system in partial collapse; rationing conversations begin.
Humanitarian escalation
Atrocity-risk thresholds crossed; international response delayed.
Coalition cohesion
Public cohesion strained; statements diverging on scope.
§02Key developments9 items · color + detail
01
pivotalpivotal ◆Euronews / Kpler
Gulf crude exports return to pre-war parity, with 40% bypassing Hormuz
Kpler data for 1-28 September put Middle East Gulf crude exports at 16.5 million barrels a day, level with the pre-war average and up from 6.0 million in March. Forty per cent now moves through alternative routes, chiefly Saudi Arabia's East-West pipeline to Yanbu and the Emirati Abu Dhabi-to-Fujairah line, cutting Hormuz's share of regional exports from 83% before the war to 60%. Kpler's Amena Bakr was cited on the shift. December Brent was put at $102.25 and WTI at $90.50, against roughly $72 pre-war; OPEC+ core production reached 25 million barrels a day in August.
Impact →Iran's single lever has been devalued at the exact moment its owner priced it at seven conditions. The unmeasured-strait prior does not retire — it inverts: the question is no longer how little passes through Hormuz but how little that now matters. A chokepoint carrying 60% rather than 83% of the region's exports is a weaker hostage, and the party holding it has published its asking price.
02
escalatingpivotal ◆Xinhua / Gulf News
Turkey and Pakistan commit forces to Saudi Arabia under the Mecca pact
After an emergency meeting of the Strategic Political and Defence Committee in Riyadh on Monday, a joint statement on the Saudi defence ministry's account said Pakistan and Turkey would "provide military forces and capabilities and ensure their rapid deployment in Saudi Arabia" and that the three would move "immediately to the practical implementation of the collective defence commitments", affirming that "the security of each party is an integral part of the collective security of the three". The Mecca Joint Defence Agreement, signed on 7 August, holds that an attack on any signatory is an attack on all. No force numbers, units, timetable or named officials were given.
Impact →The first operationalisation of a mutual-defence clause in this war, adding a NATO member and a nuclear-armed state to a theatre where Iran's ally is firing ballistic missiles at the host. Recorded as a commitment, not a deployment: without numbers or dates this is a political fact today and a military one only when forces arrive. Spillover stops being a risk category and becomes an order of battle.
03
escalatinghighAl Jazeera / CNN
Mocha and Dhubab change hands as the government declares a drive on Sanaa
Yemeni government forces said they had retaken the port of Mocha and the Dhubab district of Taiz governorate and seized positions near Bab al-Mandeb, with the Homeland Shield Forces and the Giants Brigades conducting "a large-scale military operation with air cover" that cut "supply lines and roads leading to Bab al-Mandeb", and announced a strategic offensive toward Sanaa. Coalition spokesman Turki al-Maliki said 100 fighter jets had supported the operation. The military statement reported Houthi fighters killed, wounded and captured without numbers. Al Jazeera said it could not independently verify the battlefield reports. The coalition also struck Hodeidah. The UN Secretary-General expressed "deep concern".
Impact →Mocha, taken by the Houthis in mid-September, is back in government hands within three weeks — the first reversal of a Houthi coastal gain. Per the unverified-claim-ceiling prior nothing is adopted: the toll is unnumbered on one side and unanswered on the other. Analysts put the ceiling plainly — Nicholas Brumfield said the "balance of power has not yet shifted in favour of either side".
04
escalatinghighCBS News / TBS News
The Houthis take in Riyadh's civil airport and order airlines out of Saudi airspace
Houthi spokesman Yahya Saree said drones and missiles had been fired at King Khalid International Airport in Riyadh, an Aramco refinery at Rabigh and Saudi military sites, and warned "all global airlines using Saudi airspace against continuing their flights" with the exception of airspace over Mecca and Medina. Separately a pumping station at Khurais on the roughly 1,200-kilometre East-West pipeline to Yanbu was reported struck on Sunday, Saree claiming "precise hits causing large fires"; reports conflicted over whether flow stopped, and no Saudi or Aramco damage assessment was published. Aramco's chief executive warned that "the supply resilience cushion is scarily thin".
Impact →Two target classes open in one cycle. Civil aviation over a G20 state is now declared, a cheaper way to impose cost than hitting a refinery. And the pipeline carrying the bypassed barrels is itself under fire, so the 40% that no longer needs Hormuz has acquired its own vulnerability. The escalation-ladder-by-target-class prior hardens from oil to passengers.
05
escalatinghighUKMTO / CENTCOM / Fars
Three tankers struck in Hormuz as CENTCOM publishes its blockade ledger
UKMTO recorded a third tanker struck by an unidentified projectile on Sunday after two were hit on Friday, and the Revolutionary Guards ordered another vessel to turn back or be attacked. IRGC-affiliated Fars claimed Iran had targeted 13 tankers it described as "violators" over seven days. US Central Command said it had destroyed 13 commercial vessels in the strait over twelve weeks, disabled three that refused to comply and redirected 130 others since 14 July. Admiral Brad Cooper said: "We will swiftly act against any vessels trying to run the blockade."
Impact →Two blockades now run against each other on the same water, and for the first time both publish ledgers — 13 tankers claimed by Tehran against 13 vessels destroyed by CENTCOM. The symmetry is rhetorical rather than real: one side is interdicting the other's exports while the other is taxing neutral hulls. Neither figure is independently verified; both are recorded as claims by their claimants.
06
escalatinghighJerusalem Post / CBS News
Camp David convenes, Hegseth claims the strait, and Trump rejects the seven conditions
Vance, Rubio, Hegseth, Witkoff, CIA director John Ratcliffe and Joint Chiefs chairman Dan Caine met at Camp David on Friday on the war and on Yemen. At Quantico, Hegseth said "Iran will never, ever, ever have a nuclear weapon", that Tehran "can decide to give it up the way that they should ... or it may have to happen the hard way", and that "Iran wants to play games with things like the Strait of Hormuz. They don't control it. We do", adding that the blockade "has been ironclad, and we're running almost at pre-war levels every single night". Trump ruled out Iran's reopening proposal; Pezeshkian called negotiations "meaningless".
Impact →The agenda dispute is now a sovereignty dispute: Tehran prices the strait at seven conditions while Washington denies Tehran controls it at all. There is no bargain available over an asset both sides claim to hold. With the principals convened, the terms rejected and Iran's president calling the channel pointless, the thirty-day window narrows again — hence 8 to 7.
07
mixedhighAP via US News
AP finds the Port Shuaiba drone warnings were on the table before the strike
An Associated Press investigation into the 1 March drone attack at Port Shuaiba, Kuwait, which killed six American soldiers and wounded dozens, reported that commanders under Major General John Hinson and Brigadier General Clinton Barnes relocated logistics operations to the port despite threat assessments showing it lacked adequate defence against drones and intelligence indicating it was a likely Iranian target, when a safer Kuwaiti site was available. Chief Warrant Officer 3 Robert Marzan was killed. No mass-casualty plan was in place; wounded were sent to Army barracks in Germany rather than Landstuhl Regional Medical Center, and some brain-injury diagnoses took weeks. The Army completed its investigation in June and has not released it.
Impact →The casualty-reconciliation gap acquires a documented cause rather than another number. Scored mixed because disclosure improved while the record worsened: the first granular account of an American mass-casualty event in this war comes from reporters, not from the Department that finished investigating it four months ago. Nothing is added to the ledger; the six dead are already inside the carried 17.
08
escalatingmediumTimes of Israel
Trump personally blames Iran for the Flydubai attack, against Vance and Israeli services
Asked whether Iran was responsible for the attempted crash of the flydubai aircraft, Trump said: "I do. I personally do", without elaborating. Vice President Vance said he had not seen conclusive evidence tying Tehran to it. Netanyahu and Israeli security officials assessed that the Omani co-pilot acted independently and called it premature to determine Iranian involvement. Israeli sources said fighter jets were scrambled and Israel was prepared to shoot the aircraft down before it diverted to Saudi Arabia; Shin Bet agents are taking part in the interrogation in the UAE. Netanyahu was heckled by a bereaved father at the 7 October memorial.
Impact →Attribution now splits inside one administration and across one alliance: the American president against his own vice-president and against the Israeli services holding the file. The attribution-withdrawal prior takes its sharpest form yet — the evidentiary case has not strengthened since Day 218, and the political claim has. Also recorded: Israel came within a decision of shooting down a civil airliner.
09
escalatingmediumNCRI / Iran International
Two more protesters executed as the rial hits 268,500 and gas deliveries fall 14%
Iran's judiciary announced the execution on Monday of Alireza Sepahi and Alireza Raisi, both detained during the January 2026 protests. The open-market dollar reached 268,500 tomans on 3 October, against the roughly 258,000 this series carried. National Gas Company head Saeed Tavakkoli said gas delivered to the national network ran 14% below the first six months of last year. Health commission spokesman Salman Eshaghi said authorities had "closed our eyes to people being killed" and called insurers "effectively bankrupt". Treasury warned foreign banks of sanctions without notice under Operation Economic Outcast.
Impact →The institutional-attrition prior moves from the oil ministry to the gas network and the health system, with the state's own officials supplying the figures. The rial's 268,500 against the carried 258,000 is a fresh low, not a reconciliation of the divergent rate series. Treasury's bank warning takes one of this brief's standing Brent triggers from threat to notice.
§03Strategic implications3 threads
Implication 01

The lever broke before the price could be paid

Iran has spent seven months and one declared asking price on a chokepoint that has stopped being one. Kpler's September count puts Gulf crude exports at 16.5 million barrels a day, level with the pre-war average and 10.5 million above March, with 40% moving through the Saudi line to Yanbu and the Emirati line to Fujairah; Hormuz now carries 60% of the region's exports against 83% before the war. Day 220 recorded Ghalibaf pricing the strait at seven conditions; the asset behind them is now worth roughly a quarter less, and Hegseth answered with a denial of title rather than a counter-offer: "They don't control it. We do." Analytical judgment: under the multi-clock framework the energy-infrastructure clock improved materially while the negotiation-capacity clock worsened, and the two are causally linked. A blockade that no longer blocks removes the only thing Tehran had to sell, which puts arithmetic behind Washington's stated reason for refusing the Qatari paper. The unmeasured-strait prior inverts rather than retires: the question is not how much passes through Hormuz but how little that figure decides. Watch whether Iran lowers the price or attacks the routes that replaced it — Khurais suggests the second.

Implication 02

The pact that answered the proxy, and the airliner nobody can attribute

Two alliance facts moved in opposite directions. Saudi Arabia, Turkey and Pakistan activated the Mecca Joint Defence Agreement of 7 August, under which an attack on one is an attack on all, with Ankara and Islamabad committing to "ensure their rapid deployment in Saudi Arabia" — a NATO member and a nuclear-armed state entering a theatre where Iran's ally fires ballistic missiles at the host, and the first operationalisation of a mutual-defence clause in this war. Against that, attribution of the Flydubai attack fractured inside the American government: Trump said "I do. I personally do", Vance said he had seen no conclusive evidence, and Netanyahu's own services assess the Omani co-pilot acted alone. Analytical judgment: the coalition-cohesion clock is now two clocks. The regional one deepened — three states, one clause, forces pledged; the Atlantic one has not recovered from the Fairford withdrawal, and the evidentiary basis for the war's newest grievance is weaker than the political claim attached to it. Treat the Mecca commitment as political until numbers and dates appear; treat the attribution split as the more consequential, because a president ahead of his own intelligence is how unauthorised escalation has started before.

Implication 03

Taiwan: the cargo question turns on routes now, not on the strait

No fresh Taiwan-relevant development today; prior assessments are unchanged. The T$415 billion package — T$233.8 billion into CPC against T$127.6 billion of accumulated losses — remains before parliament unvoted, and the Qatari and Emirati LNG return is still placed in October. What changed is the frame rather than the facts. If Gulf crude is back at pre-war volumes with 40% bypassing Hormuz, the binding constraint on Taipei's cargoes is no longer the strait's closure but whether the bypass routes hold and whether LNG, which cannot use an oil pipeline, follows crude's recovery at all. It does not: Qatari gas has no Yanbu or Fujairah equivalent, so Taiwan's exposure is strictly worse than the headline recovery implies. Analytical judgment: the mediator-is-also-the-supplier prior sharpens — Doha is still both broker and withheld shipper, and today Washington rejected the terms its broker was carrying. The fiscal-buffer prior holds against December Brent at $102.25 and a Q4 forecast near $106.60. Watch whether CPC publishes an October supply assurance, and whether any party distinguishes crude recovery from gas recovery in public — the conflation is the risk Taipei cannot afford to inherit.

§04Casualties snapshotCumulative · ±24–48h Δ
United States
KIA17WIA440
Israel
KIA56WIA8,652
Iran & Proxies
KIA3,559WIA27,400
Other
KIA3,678WIA10,804
§05Casualties detailsPer-actor notes
Total KIA (all actors)
7,310
Total WIA (all actors)
47,296
KIA Δ vs. prior brief
+0
0.0% · ~24h
United StatesKIA 17 · WIA 440
The combat series holds at 17 killed and 440 wounded with nothing disclosed for a sixth cycle, but the record improved from an unexpected direction. An AP investigation into the 1 March Port Shuaiba attack reported that commanders relocated logistics operations to the Kuwaiti port despite assessments showing it could not defend against drones and intelligence naming it a likely target, that no mass-casualty plan existed, that wounded were sent to Army barracks in Germany rather than Landstuhl, and that some brain-injury diagnoses took weeks. The Army finished investigating in June and has published nothing. The president's 18 still sits unreconciled against his own Department's August database.
IsraelKIA 56 · WIA 8,652
Iran-front casualties hold at 56 killed and 8,652+ wounded. The aviation injuries stay out of this ledger and the case for keeping them out strengthened again: Netanyahu's own security services assess the co-pilot acted alone, while the American president says he personally blames Iran and his vice-president says the evidence is not conclusive. Newly disclosed: Israel scrambled fighters and was prepared to shoot the airliner down before it diverted to Saudi Arabia. Twenty-one days to the 27 October vote.
Iran & ProxiesKIA 3,559 · WIA 27,400
No new official Iranian war toll and a twenty-seventh day without a confirmed launch against a host state. The ledger's movement was economic: the dollar at 268,500 tomans, gas to the national network 14% below last year, and the parliamentary health commission's own spokesman describing a bankrupt insurance system and deaths from medicine shortages. Two more January protesters, Alireza Sepahi and Alireza Raisi, were executed — carried on the separate protest roster, never merged with the war toll.
OtherKIA 3,678 · WIA 10,804
No adopted delta for a third day. Government forces reported Houthi dead, wounded and captured at Mocha and Dhubab without numbers; the Houthis answered with claims against Saudi targets rather than a counter-toll; Al Jazeera could not verify either side. A reported 70-plus combatants killed in one day at Taiz is recorded and not adopted. The movement is territorial: Mocha back in government hands three weeks after it fell, and the roads to Bab al-Mandeb cut. Displacement holds above 145,000 against 22.3 million needing aid.
Note — figures are cumulative open-source estimates. Revisions logged via casualty_revision:true in brief frontmatter.
§07Sources30 citations
  1. [01]Euronews — Middle East oil exports return to pre-war levels, excluding Iran
    ↳ https://www.euronews.com/2026/10/05/middle-east-oil-exports-return-to-pre-war-levels-excluding-iran
  2. [02]Kpler — Explainer: how Mideast Gulf crude exports returned to pre-war levels
    ↳ https://www.kpler.com/blog/explainer-how-mideast-gulf-crude-exports-returned-to-pre-war-levels
  3. [03]BOE Report — Middle East oil exports top pre-war levels in September, but tanker attacks increase
    ↳ https://boereport.com/2026/10/05/middle-east-oil-exports-top-pre-war-levels-in-september-but-tanker-attacks-increase/
  4. [04]Trading Economics — Brent crude oil price and market commentary
    ↳ https://tradingeconomics.com/commodity/brent-crude-oil [archived]
  5. [05]Xinhua — Pakistan, Türkiye agree to deploy forces, capabilities in Saudi Arabia amid Houthi threats
    ↳ https://english.news.cn/20261006/5ff16640ca054b1098833b9a4a1676b0/c.html
  6. [06]Gulf News — Turkey, Pakistan to deploy forces to Saudi amid Houthi attacks (joint statement)
    ↳ https://gulfnews.com/world/gulf/saudi/turkey-pakistan-to-deploy-forces-to-saudi-amid-houthi-attacks-joint-statement-1.500699553
  7. [07]WION — Turkey, Pakistan to rapidly deploy troops to Saudi Arabia under Mecca Joint Defence Agreement
    ↳ https://www.wionews.com/world/turkey-pakistan-to-rapidly-deploy-troops-to-saudi-arabia-under-mecca-joint-defence-agreement-as-houthi-attacks-escalate-1791227340249
  8. [08]Al Jazeera — Yemen government forces report recapture of Mocha from Houthis
    ↳ https://www.aljazeera.com/news/2026/10/5/yemen-forces-claim-to-seize-dhubab-sites-near-bab-al-mandeb-from-houthis
  9. [09]Al Jazeera — Yemeni gov't forces aim for Sanaa, but Houthi defeat will be a challenge
    ↳ https://www.aljazeera.com/news/2026/10/5/yemeni-govt-forces-aim-for-sanaa-but-houthi-defeat-will-be-a-challenge
  10. [10]Al Jazeera — Yemen war: what's the latest, as government forces claim advances?
    ↳ https://www.aljazeera.com/news/2026/10/5/yemen-war-escalates-whats-the-latest-on-the-battlefield
  11. [11]CNN — Saudi-backed forces push against Houthis near key global trade route
    ↳ https://www.cnn.com/2026/10/04/middleeast/yemen-offensive-houthis-intl
  12. [12]The National — Houthis push for Taiz as fighting intensifies around strategic Yemeni city
    ↳ https://www.thenationalnews.com/news/gulf/2026/10/04/yemen-houthis-taiz/
  13. [13]CBS News — Iran war updates: battle for control of Red Sea, attacks on energy infrastructure temper news of rising oil flow
    ↳ https://www.cbsnews.com/live-updates/iran-war-trump-us-oil-prices-yemen-red-sea-houthis-bab-el-mandeb/
  14. [14]CBS News — Senior Trump administration officials met to discuss Iran war at Camp David
    ↳ https://www.cbsnews.com/live-updates/trump-iran-war-us-midterm-elections-troops-deployment/
  15. [15]TBS News — Saudi Arabia's East-West oil pipeline halted again after fresh attack
    ↳ https://tbsnews.net/worldbiz/middle-east/saudi-arabias-east-west-oil-pipeline-halted-again-after-fresh-attack-1563431
  16. [16]Türkiye Today — Saudi East-West pipeline halted again after fresh attack
    ↳ https://turkiyetoday.com/region/saudi-east-west-pipeline-halted-again-after-fresh-attack-3229662
  17. [17]Haaretz — Houthis claim drone and missile attack on Saudi Aramco facility in Riyadh
    ↳ https://www.haaretz.com/middle-east-news/2026-10-04/ty-article/houthis-claim-drone-and-missile-attack-on-saudi-aramco-facility-in-riyadh/000001a1-0355-d8d3-aba3-2b77eb690000
  18. [18]Anadolu Agency — Houthis claim missile, drone attack on Saudi Aramco in Riyadh
    ↳ https://www.aa.com.tr/en/middle-east/houthis-claim-missile-drone-attack-on-saudi-aramco-in-riyadh/4077303
  19. [19]Iran International — Live: tanker hit by unknown projectile in Strait of Hormuz, UKMTO says (October 3-5 liveblog)
    ↳ https://www.iranintl.com/en/liveblog/202610033293
  20. [20]Iran International — Tanker hit by unknown projectile in Strait of Hormuz, UKMTO says
    ↳ https://www.iranintl.com/en/202610044767
  21. [21]Jerusalem Post — Pete Hegseth warns Iran will 'never' get nuclear bomb, touts Hormuz blockade
    ↳ https://www.jpost.com/middle-east/iran-news/article-910482
  22. [22]Times of Israel — Hegseth says US blockade of Strait of Hormuz 'ironclad'
    ↳ https://www.timesofisrael.com/liveblog_entry/hegseth-says-us-blockade-of-strait-of-hormuz-ironclad/
  23. [23]Times of Israel — Liveblog, October 5, 2026 (Trump on flydubai attribution, scrambled jets, October 7 memorial)
    ↳ https://www.timesofisrael.com/liveblog-october-5-2026/
  24. [24]Fox News — Iran talking peace, but unwilling to bend to Trump, US nuclear demands
    ↳ https://www.foxnews.com/live-news/us-iran-war-hormuz-strait-peace-talks-donald-trump-october-4
  25. [25]Al Jazeera — Iran says Strait of Hormuz to remain closed until US meets conditions
    ↳ https://www.aljazeera.com/news/2026/10/4/iran-says-strait-of-hormuz-to-remain-closed-until-us-meets-conditions
  26. [26]AP via US News — The Latest: soldiers seriously wounded in Iranian drone strike tell AP the US military failed them
    ↳ https://www.usnews.com/news/us/articles/2026-10-05/the-latest-soldiers-seriously-wounded-in-iranian-drone-strike-tell-ap-the-us-military-failed-them
  27. [27]AP via Ottumwa Courier — Takeaways from AP report on Iranian attack in Kuwait that killed 6 US soldiers and wounded dozens
    ↳ https://www.ottumwacourier.com/news/state_news/takeaways-from-ap-report-on-iranian-attack-in-kuwait-that-killed-6-us-soldiers-and/article_094b9285-f875-5916-adb3-d203b6629ee6.html
  28. [28]NCRI — Rial hits 268,500 as lawmaker says drug crisis is killing patients and gas deliveries fall
    ↳ https://www.ncr-iran.org/en/news/iran-protests/rial-hits-268500-as-lawmaker-says-drug-crisis-is-killing-patients-and-gas-deliveries-fall/
  29. [29]NIAC — China and Russia reject snapback sanctions as Iran's oil fleet briefly goes visible amid renewed US pressure
    ↳ https://niacouncil.org/china-and-russia-reject-snapback-sanctions-as-irans-oil-fleet-briefly-goes-visible-amid-renewed-u-s-pressure/
  30. [30]Washington Post — A Pentagon dispute in Trump's first war foreshadowed Iran challenges
    ↳ https://www.washingtonpost.com/world/2026/10/05/pentagon-dispute-trumps-first-war-foreshadowed-iran-challenges/