$FF4052 · player one
Daniel Plas Rivera.
I put characters where Capcom never shipped them—and build AI that has to show its work.
Software architect in New York. After hours: 68000 assembly, characters in games they never shipped in, and a fighting-game agent trained on a friend's matches.
Characters Capcom never put here.
New arrivals, old hardware, and every engine assumption that fought back.
Cross Fever for arcade XMvsSF, MSHvsSF and Marvel vs. Capcom
Four humans, four fighters, one CPS-2 board — plus MVC1's Duo, with its pose and fly-in, for X-Men vs. Street Fighter and MSHvsSF, under MVC1's meteor sky with MVC1's ∞ meter. Five patches with drag-and-drop installers for your own ROM (MSHvsSF's for both its USA and Euro sets), each with its tested scope stated.
Delayed Hyper Combo for arcade Marvel vs. Capcom
DHC v11: eighteen color choices, six native match-report pages and focused DHC repairs. Classic/REMIX, three bars, original artwork and labeled historical videos remain. ROM-free community release with explicit native-test limits.
I Wanted Cable Without MvC2. So I Put Him in MvC1.
Cable's historical Ryu-slot v33 build ran in MvC1, but that donor lineage is retired. The current native-$32 branch is a structural-only v17 head with all 52 gameplay lanes still open.
Your AI can sound right and still be wrong.
Bad citations, misleading evaluations, and tools that keep the lab honest.
MCP · built for the arcade lab
Your AI Read the Repo. It Still Missed the Blocker.
Old write-ups made unfinished ports sound ready. I built a read-only MCP server with 21 tools to retrieve the current evidence without granting permission to run or publish.
AI systems · implementation note
The Citation Is Real. The Answer Is Wrong.
A manual's storage limit becomes an operating limit, with a perfect footnote. Why real quotes and valid schemas still aren't proof.
Evaluation · implementation note
Your New AI Model Looks Smarter. It Might Be a Downgrade.
A prettier answer can hide a worse production system. Compare against the model you already run, inspect the failures, and make the judge prove itself too.
Recent writing
The latest experiments and what changed.
· 7 min$41SF3 TAG V4.3: Justin Wong Mode, reproduced bugs and independent fixesUnofficial SF3 TAG V4.3 preview: matched before/after repairs for bugs shown in Justin Wong’s review, a held post-winner report, chosen CPU teams and explicit Party assistance. Install from your own clean game with paced Fightcade and RetroArch guides.Oct 4, 2026
· 5 min$40One-on-one Marvel vs. CapcomOne fighter per side, first-to-two rounds, restored Infinity Gems from Marvel Super Heroes and playable Tomichin. Install from your own clean archives.Oct 3, 2026
· 6 min$3EI Put Strider Into MSHvsSF. Here's the Patch.Strider Hiryu from Marvel vs. Capcom is playable in arcade Marvel Super Heroes vs. Street Fighter, in the select-screen square that only showed a logo. His MvC code, sprites, sounds, three hypers and ending come out of your own mvsc.zip. One installer for the Euro set Fightcade plays and the USA set.Sep 28, 2026
· 10 min$3FX-Men vs. Street Fighter, Three on ThreeXMvsSF 3v3 + DHC v1.1 makes arcade X-Men vs. Street Fighter (1996) three on three, in the style of Marvel vs. Capcom 2: three picks per side in eighteen colours, MP+MK and MP+HK tags to either reserve, Delayed Hyper Combos up to three Hypers long where the motion you enter picks each Hyper, snapbacks that choose who you fight next, CPU teams of three up to Apocalypse, six players with one controller per character, and an optional 512×224 arena. 17,632 bytes of new 68000 code and 89 hooks, with a RetroArch core of its own for Windows, Linux and macOS on Apple silicon, and a two-player preview for Fightcade's own FinalBurn Neo.Sep 28, 2026
· 44 min
One more rabbit hole
Still wondering how that worked?
Start with the native character ports, follow the bot's training failures, or send me the bug you can't leave alone.