Add Futility LMR (official-clockwork#319)

ProgramciDusunur · web-flow · commit 4b4b64c5be21 · 2025-11-07T15:43:22.000+01:00
``` Test | futility-lmr Elo | 1.87 +- 1.26 (95%) SPRT | 8.0+0.08s Threads=1 Hash=16MB LLR | 2.96 (-2.94, 2.94) [0.00, 5.00] Games | N: 97996 W: 23881 L: 23354 D: 50761 Penta | [1105, 11698, 22878, 12199, 1118] ``` https://clockworkopenbench.pythonanywhere.com/test/907/ ``` Test | futility-lmr Elo | 2.35 +- 1.87 (95%) SPRT | 40.0+0.40s Threads=1 Hash=64MB LLR | 2.97 (-2.94, 2.94) [0.00, 5.00] Games | N: 39600 W: 9184 L: 8916 D: 21500 Penta | [250, 4727, 9616, 4919, 288] ``` https://clockworkopenbench.pythonanywhere.com/test/908/ bench: 11343803
diff --git a/src/search.cpp b/src/search.cpp
@@ -670,6 +670,7 @@ Value Worker::search(
 
             if (quiet) {
                 reduction += (1024 - move_history / 8);
+                reduction += (ss->static_eval + 500 + 100 * depth <= alpha && !is_in_check) * 1024;
             }
 
             if (!quiet) {

Original file line number	Diff line number	Diff line change
`@@ -670,6 +670,7 @@ Value Worker::search(`
`670`	`670`
`671`	`671`	`if (quiet) {`
`672`	`672`	`reduction += (1024 - move_history / 8);`
	`673`	`+ reduction += (ss->static_eval + 500 + 100 * depth <= alpha && !is_in_check) * 1024;`
`673`	`674`	`}`
`674`	`675`
`675`	`676`	`if (!quiet) {`