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Increase pruning if evaluation is not improving

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Add an additional set of margins to movecount pruning
to be used when static evaluation is getting worse
than previous move.

Here are the margins table with changing
depth (fm0 not improving, fm1 improving):

    d: 0, fm0: 3, fm1: 3
    d: 1, fm0: 4, fm1: 4
    d: 2, fm0: 6, fm1: 6
    d: 3, fm0: 7, fm1: 10
    d: 4, fm0: 11, fm1: 15
    d: 5, fm0: 15, fm1: 21
    d: 6, fm0: 21, fm1: 29
    d: 7, fm0: 27, fm1: 37
    d: 8, fm0: 35, fm1: 47
    d: 9, fm0: 42, fm1: 57
    d: 10, fm0: 51, fm1: 68
    d: 11, fm0: 60, fm1: 81
    d: 12, fm0: 70, fm1: 94
    d: 13, fm0: 81, fm1: 108
    d: 14, fm0: 92, fm1: 123
    d: 15, fm0: 104, fm1: 139

Good at both short TC

LLR: 2.97 (-2.94,2.94)
Total: 11502 W: 2503 L: 2361 D: 6638

And long TC

LLR: 2.98 (-2.94,2.94)
Total: 7189 W: 1421 L: 1277 D: 4491

bench: 4364793
This commit is contained in:
Eelco de Groot
2013-07-29 01:16:25 +02:00
committed by Marco Costalba
parent d30dfc084c
commit 5ee16a180a
2 changed files with 16 additions and 11 deletions
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2
src/types.h
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@@ -90,7 +90,7 @@ typedef uint64_t Bitboard;
const int MAX_MOVES = 192;
const int MAX_PLY = 100;
const int MAX_PLY_PLUS_2 = MAX_PLY + 2;
const int MAX_PLY_PLUS_3 = MAX_PLY + 3;
/// A move needs 16 bits to be stored
///