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Include all blockers in king danger

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Simplification: in king danger, include all blockers and not only pinned
pieces, since blockers enemy pieces can result in discovered checks which
are also bad.

STC  http://tests.stockfishchess.org/tests/view/5af35f9f0ebc5968e6523fe9
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 145781 W: 29368 L: 29478 D: 86935

LTC http://tests.stockfishchess.org/tests/view/5af3cb430ebc5968e652401f
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 76398 W: 11272 L: 11232 D: 53894

I also incorrectly scheduled STC with [0,5] which it failed.
http://tests.stockfishchess.org/tests/view/5af283c00ebc5968e6523f33
LLR: -2.94 (-2.94,2.94) [0.00,5.00]
Total: 12338 W: 2451 L: 2522 D: 7365

Closes https://github.com/official-stockfish/Stockfish/pull/1593

bench: 4698290

----------------------------------------

Thanks to @vondele and @Rocky640 for a cleaner version of the patch,
and the following comments!

> Most of the pinned, (or for this pull request, blocking) squares were
> already computed in the unsafeChecks, the only missing squares being:
>
> a) squares attacked by a Queen which are occupied by friendly piece
>    or "unsafe". Note that adding such squares never passed SPRT[0,5].
>
> b) squares not in mobilityArea[Us].
>
> There is a strong relationship between the blockers and the unsafeChecks,
> but the bitboard unsafeChecks is still useful when the checker is not
> aligned with the king, and the checking square is occupied by friendly
> piece or is "unsafe". This is always the case for the Knight.
This commit is contained in:
mstembera 2018-05-10 13:49:56 -07:00 • committed by Stéphane Nicolet
parent 255df4ffae
commit c163c2fcb0
1 changed files with 2 additions and 3 deletions
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5
src/evaluate.cpp
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@ -420,7 +420,7 @@ namespace {
: AllSquares ^ Rank1BB ^ Rank2BB ^ Rank3BB); : AllSquares ^ Rank1BB ^ Rank2BB ^ Rank3BB);
const Square ksq = pos.square<KING>(Us); const Square ksq = pos.square<KING>(Us);
Bitboard weak, b, b1, b2, safe, unsafeChecks, pinned; Bitboard weak, b, b1, b2, safe, unsafeChecks;
// King shelter and enemy pawns storm // King shelter and enemy pawns storm
Score score = pe->king_safety<Us>(pos, ksq); Score score = pe->king_safety<Us>(pos, ksq);
@ -472,12 +472,11 @@ namespace {
// Unsafe or occupied checking squares will also be considered, as long as // Unsafe or occupied checking squares will also be considered, as long as
// the square is in the attacker's mobility area. // the square is in the attacker's mobility area.
unsafeChecks &= mobilityArea[Them]; unsafeChecks &= mobilityArea[Them];
pinned = pos.blockers_for_king(Us) & pos.pieces(Us);
kingDanger += kingAttackersCount[Them] * kingAttackersWeight[Them] kingDanger += kingAttackersCount[Them] * kingAttackersWeight[Them]
+ 102 * kingAttacksCount[Them] + 102 * kingAttacksCount[Them]
+ 191 * popcount(kingRing[Us] & weak) + 191 * popcount(kingRing[Us] & weak)
+ 143 * popcount(pinned | unsafeChecks) + 143 * popcount(pos.blockers_for_king(Us) | unsafeChecks)
- 848 * !pos.count<QUEEN>(Them) - 848 * !pos.count<QUEEN>(Them)
- 9 * mg_value(score) / 8 - 9 * mg_value(score) / 8
+ 40; + 40;