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302e0f7)
This change to the Rook psqt encourages rook lifts to the third rank
on the two center files.
STC 10+0.1 th 1 :
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 40654 W: 9028 L: 8704 D: 22922
http://tests.stockfishchess.org/tests/view/
5d885da60ebc5906dd3e9fcd
LTC 60+0.6 th 1 :
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 56963 W: 9530 L: 9196 D: 38237
http://tests.stockfishchess.org/tests/view/
5d88618c0ebc5906dd3ea45f
Thanks to @snicolet for mentioning that Komodo does this a lot and
Stockfish doesn't, which gave me the idea for this patch, and to
@noobpwnftw for providing cores to fishtest which allowed very quick
testing.
Future work: perhaps this can be refined somehow to encourage this
on other files, my attempts have failed.
Closes https://github.com/official-stockfish/Stockfish/pull/2322
Bench:
3950249
{ // Rook
{ S(-24, -2), S(-13,-6), S(-7, -3), S( 2,-2) },
{ S(-18,-10), S(-10,-7), S(-5, 1), S( 9, 0) },
{ // Rook
{ S(-24, -2), S(-13,-6), S(-7, -3), S( 2,-2) },
{ S(-18,-10), S(-10,-7), S(-5, 1), S( 9, 0) },
- { S(-21, 10), S( -7,-4), S( 3, 2), S(-1,-2) },
+ { S(-21, 10), S( -7,-4), S( 3, 2), S( 7,-2) },
{ S(-13, -5), S( -5, 2), S(-4, -8), S(-6, 8) },
{ S(-24, -8), S(-12, 5), S(-1, 4), S( 6,-9) },
{ S(-24, 3), S( -4,-2), S( 4,-10), S(10, 7) },
{ S(-13, -5), S( -5, 2), S(-4, -8), S(-6, 8) },
{ S(-24, -8), S(-12, 5), S(-1, 4), S( 6,-9) },
{ S(-24, 3), S( -4,-2), S( 4,-10), S(10, 7) },