typhoon.git - The typhoon chess playing engine.

Age	Commit message (Collapse)	Author
13 days	Fix integer divide-by-zero in script.c's post-suite histogram printer.	Scott Gasch
	uMax (the largest histogram bucket count) can be 0 when a script run's positions are all unsolved -- ASSERT(uMax > 0) doesn't stop this in a non-DEBUG build, and the following loop unconditionally divides by uMax, crashing with SIGFPE. Hit repeatedly today running single-position diagnostic scripts (an isolated unsolved position naturally has an all-zero histogram) while investigating an LMR regression on ECM.213. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01YGSMkwjqiCk4XhbfN7ugD2
13 days	Baseline: uPositional data-calibrated fix, enprise/trapped hints, ↵	Scott Gasch
	EBF/beta-cutoff/counter-move stats, script.c FPE fix. No LMR, no counter-move-driven move ordering (both explored separately, kept out for now -- counter-move measured worse, ~655->647 solved on ecm879 @ sn=4M with a leaner tree beforehand). Futility pruning restored. Verified: 647/879 solved, EBF 4.609 @ sn=4M; 684/879 solved, EBF 3.995 @ 20s/move, 1cpu, 256m hash (typhoon_baseline.log). The counter-move table is still written and its stats still tracked (dynamic.c) for diagnostic purposes, but generate.c no longer reads it for move ordering, so it has no effect on search behavior in this commit. lmr_testing/ holds the in-flight graded-LMR + counter-move code (not applied here) with notes on what was already tried and measured, so a future session can resume without re-deriving it.
2016-06-01	Initial checkin for typhoon chess engine.	Scott Gasch