A time ago, I was watching a game (4’ + 2”).
[d]6k1/1p3qpp/5p2/b2r1b2/5B2/P4N2/1P2QPPP/R5K1 b - - 0 28
SF_171 (White) has a Pawn more and after 28…g5 29.b4 waiting for 29…Bd8. But opponent plays 29…Bxb4 and now SF is wrong 30.axb4 (better 30.Bxg5) gxf4 (=).
[d] 6k1/1p3q1p/5p2/3r1b2/1P3p2/5N2/4QPPP/R5K1 w - - 0 31
SF lost the pawn and all advantage. Why?
Probably, too high penalty, for doubled (x1) isolated (x2) pawns (f6 & f4), was one of possible reasons (40 + 40 + 23).
Now I found it (game 3): http://www.open-chess.org/viewtopic.php?f=3&t=351#p3089
[d] 8/8/8/3B1pk1/2K3p1/5nP1/4RP2/5r2 w - -
SF 1.8 plays 1.Bxf3 ?? gxf3 -+ Again doubled isolated pawns.
Too high penalty?
Moderators: hgm, Rebel, chrisw
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Re: Too high penalty?
The second position is no good example for possibly too high double/isolated pawn penalty. As long as the engine does not see that Bxf3 loses material and the game, she will play it regardless how high the double/isolated pawn penalty is. Apart from this SF 1.8 sees very fast that Bxf3 loses. This blunder can only be played under heavy time pressure.
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- Posts: 1136
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Re: Too high penalty?
I found a solution.
The following modern algorithm_of_weak_pawns is short and simple. It based at mobility and safety, fundament properties of each piece, pawns too.
A pawn which is not mobile “(blocked || controlled) && !(pos.attacks_from<PAWN>(s, Us) & theirPawns)” is susceptible to attack (if “!chain”). It needs to say goodbye: candidate, double, isolated, backward and opposed pawns.
It should work better with deep and aggressive pruning.
The following modern algorithm_of_weak_pawns is short and simple. It based at mobility and safety, fundament properties of each piece, pawns too.
A pawn which is not mobile “(blocked || controlled) && !(pos.attacks_from<PAWN>(s, Us) & theirPawns)” is susceptible to attack (if “!chain”). It needs to say goodbye: candidate, double, isolated, backward and opposed pawns.
It should work better with deep and aggressive pruning.
Code: Select all
template<Color Us>
Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
Bitboard theirPawns, PawnInfo* pi) const {
// added 3 variables:
Value penalty_midgame = 25;
Value penalty_endgame = 40;
Score penalty = make_score(penalty_midgame, penalty_endgame);
// changes from the following line to the end of function
b = rank_bb(r) | rank_bb(r + (Us == WHITE ? -1 : 1));
chain = ourPawns & neighboring_files_bb(f) & b;
passed = !(theirPawns & passed_pawn_mask(Us, s)) && !(ourPawns & squares_in_front_of(Us, s));
blocked = (ourPawns | theirPawns) & squares_in_front_of(Us, s) & rank_bb(r + (Us == WHITE ? 1 : -1));
controlled = pos.attacks_from<PAWN>(s + pawn_push(Us), Us) & theirPawns);
weak = !chain && (blocked || controlled) && !(pos.attacks_from<PAWN>(s, Us) & theirPawns);
if (weak)
value -= penalty;
if (passed)
set_bit(&(pi->passedPawns), s);
}
return value;
}
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- Posts: 1136
- Joined: Sun Feb 14, 2010 10:02 pm
Re: Too high penalty?
The first game is won by the new version.
Code: Select all
[Event "Computer chess game"]
[Site ""]
[Date "2010.07.09"]
[Round "?"]
[White "Sfx"]
[Black "Sf"]
[Result "*"]
[ECO "A40"]
[Opening "Queen's Pawn"]
[Time "16:36:25"]
[Variation "Bozo-Indian Defence, Four Pawns Attack"]
[TimeControl "180+2"]
[Termination "normal"]
[PlyCount "148"]
[WhiteType "program"]
[BlackType "program"]
1. e4 {(e2e4 Nb8c6 Ng1f3 Ng8f6 Nb1c3 e7e5 Bf1b5 Bf8d6 OO Nc6d4 d2d3 OO
Bc1g5) +0.36/12 12} Nc6 {(Nb8c6 Nb1c3 Ng8f6 Ng1f3 e7e5 Bf1b5 Bf8d6 OO OO
d2d4 e5xd4 Nf3xd4 a7a6) -0.36/11 6} 2. d4 {(d2d4 e7e6 Ng1f3 d7d5 e4xd5
e6xd5 Bf1d3 Ng8f6 OO Bf8e7 Nb1c3 OO Bc1f4 Bc8e6) +0.52/12 14} Nf6 {(Ng8f6
Nb1c3 e7e6 e4e5 Nf6d5 Nc3xd5 e6xd5 Ng1f3 Bf8e7 Bf1b5 OO OO d7d6 Bc1f4
Bc8f5) -0.44/11 12} 3. d5 {(d4d5 Nc6b8 Nb1c3 e7e6 d5xe6 d7xe6 Qd1xd8+
Ke8xd8 Bc1f4 Nb8d7 OOO Bf8c5 Ng1f3 Bc5xf2 Bf1b5) +1.05/10 5} Ne5 {(Nc6e5
Ng1f3 Ne5xf3+ Qd1xf3 e7e6 Nb1c3 e6xd5 e4xd5 Bf8c5 Bc1e3 Bc5xe3 Qf3xe3+
Qd8e7) -0.36/10 5} 4. f4 {(f2f4 Ne5g6 e4e5 Nf6e4 Bf1d3 Ne4c5 Ng1f3 Nc5xd3+
c2xd3 e7e6 d5xe6 Bf8b4+ Bc1d2 Bb4xd2+ Ke1xd2 Ng6xf4) +0.28/9 12} Ng6
{(Ne5g6 e4e5 Nf6e4 Qd1d4 f7f5 Nb1c3 c7c5 d5xc6/ep d7xc6 Ng1f3 Qd8xd4 Nf3xd4
e7e6) -0.08/11 10} 5. e5 {(e4e5 Nf6g8 Ng1f3 e7e6 Nb1c3 Ng8h6 Nc3e4 Nh6g4
Nf3g5 f7f5 d5xe6 f5xe4 Qd1xg4) +1.01/10 9} Ne4 {(Nf6e4 f4f5 c7c6 f5xg6
h7xg6 Nb1c3 Ne4g3 h2xg3 Rh8xh1 Ng1f3 Qd8b6 Qd1d4 c6xd5 Qd4xb6 a7xb6 Nc3xd5)
-0.80/10 10} 6. f5 {(f4f5 Ng6xe5 Qd1d4 Ne4f6 Qd4xe5 d7d6 Qe5d4 c7c6 d5xc6
b7xc6) +1.69/9 5} c6 {(c7c6 f5xg6 h7xg6 Qd1f3 c6xd5 Nb1c3 Qd8a5) -1.05/11
10} 7. fxg6 {(f5xg6 h7xg6 Qd1d3 c6xd5 Nb1c3 Ne4xc3 b2xc3 e7e6 Ke1d1 Bf8c5
Ng1f3 b7b5 Bc1g5 Qd8a5) +1.93/10 8} hxg6 {(h7xg6 Qd1d3 c6xd5 Nb1c3 Rh8h5
Bf1e2 Rh5xe5 Ng1f3 Re5e6 Nc3xd5 Ne4c5) -1.81/9 5} 8. Qd3 {(Qd1d3 c6xd5)
+2.02/12 11} Qa5+ {(Qd8a5+ Nb1c3 Ne4xc3 Qd3xc3 Qa5xc3+ b2xc3 c6xd5 Bc1e3
e7e6 Ng1f3 d7d6 Ke1d2) -2.02/11 12} 9. Nc3 {(Nb1c3 Ne4xc3 b2xc3 c6xd5 Ng1f3
e7e6 Bc1d2 Bf8a3 c3c4 Qa5c5 Ra1b1 d5xc4 Qd3xc4) +2.02/11 6} Nxc3 {(Ne4xc3
Qd3xc3 Qa5xc3+ b2xc3 c6xd5 Bc1e3 b7b6 OOO Bc8b7 Ng1f3 Ra8c8 Kc1b2 e7e6
Bf1b5 Bf8a3+ Kb2b3 a7a6 Bb5d3 Ba3c5 Be3xc5 Rc8xc5) -1.89/12 9} 10. Qxc3
{(Qd3xc3 Qa5xd5 Ng1f3 d7d6 Bc1e3 Bc8e6 Bf1d3 d6xe5 Qc3xe5 Qd5xe5 Nf3xe5
Rh8h5 Ne5xg6 f7xg6 Bd3xg6+ Be6f7 Bg6xh5 Bf7xh5) +2.18/11 8} Qxc3+ {(Qa5xc3+
b2xc3 c6xd5 Ng1f3 b7b6 Bc1e3 Bc8b7 OOO Ra8c8 Kc1b2 e7e6 Bf1b5 Bf8a3+ Kb2b3
a7a6 Bb5d3 Ba3c5 Be3xc5 Rc8xc5) -1.93/12 5} 11. bxc3 {(b2xc3 c6xd5 Bc1e3
e7e6 Ke1d2 b7b6 Ng1f3 Bf8c5 Bf1b5 Bc5xe3+ Kd2xe3 Bc8b7) +2.38/9 0} cxd5
{(c6xd5 Ng1f3 e7e6 Bc1e3 d7d6 Ke1d2 Bc8d7 Ra1b1 b7b6 Bf1e2 Bf8e7 Be3d4
Ke8f8 c3c4 d6xe5 Nf3xe5 Be7g5+ Bd4e3) -1.85/13 9} 12. Nf3 {(Ng1f3 e7e6
Bc1e3 b7b6 Ke1d2 Bc8b7 Ra1b1 Ra8c8 h2h3 Bf8c5 Be3xc5 Rc8xc5 Bf1b5 Ke8e7)
+2.18/13 6} f6 {(f7f6 Bc1e3 g6g5 OOO g5g4 Nf3e1 f6xe5 Rd1xd5 d7d6 Bf1e2
Bc8d7 Kc1b1 Bd7e6) -1.77/12 10} 13. Be3 {(Bc1e3 g6g5 e5xf6 g7xf6 OOO g5g4
Nf3e1 e7e6 Ne1d3) +2.26/8 4} g5 {(g6g5 OOO e7e6 e5xf6 g7xf6 Bf1b5 g5g4
Nf3d2 Bf8d6 h2h4 a7a6 Bb5d3) -1.85/11 7} 14. exf6 {(e5xf6 g7xf6 OOO b7b6
Bf1e2 e7e6 h2h4 g5xh4 Kc1b2 Bf8c5 Nf3d4) +2.46/10 4} gxf6 {(g7xf6 Nf3d4
a7a6 Bf1e2 e7e5 Nd4f5 d7d6 OO Bc8e6 Be2g4 Ra8c8 Nf5xd6+ Bf8xd6 Bg4xe6
Rc8xc3) -1.69/10 6} 15. O-O-O {(OOO e7e6 h2h4 g5xh4 Kc1b2 b7b6 Bf1b5 Bc8b7
Nf3xh4 Bf8c5 Be3f4) +2.38/11 10} e6 {(e7e6 Bf1e2 b7b6 h2h4 g5xh4 Nf3xh4
Ke8f7 Nh4f3 Bf8a3+ Kc1b1 Bc8b7) -1.93/10 13} 16. h4 {(h2h4 b7b6 h4h5 Bc8b7
Bf1d3 Ra8c8 Kc1b2 e6e5 Bd3f5 Bf8a3+ Kb2b3 e5e4) +2.50/10 4} gxh4 {(g5xh4
g2g3 h4h3 Rh1xh3 Rh8xh3 Bf1xh3 Bf8d6 g3g4 b7b6 Kc1b2) -1.85/9 3} 17. Nxh4
{(Nf3xh4 b7b6 Bf1d3 Bc8b7 Nh4g6 Rh8xh1 Rd1xh1 Bf8a3+ Kc1d2 e6e5 Rh1h7
Ra8c8) +2.30/10 11} b6 {(b7b6 Bf1d3 Rh8g8 Nh4g6 Bf8d6 Kc1b1 Bc8b7 Rh1h7
f6f5 Ng6f4 Bd6xf4 Be3xf4 Rg8xg2) -1.65/10 9} 18. Bd3 {(Bf1d3 Bf8c5 Kc1d2
Bc5xe3+ Kd2xe3 Bc8b7 Nh4g6 Rh8g8 Ke3d2 Ke8f7 Rh1h7+ Rg8g7 Rd1h1 Ra8c8)
+2.22/10 4} Bd6 {(Bf8d6 Nh4g6 Rh8g8 Kc1b1 Bc8b7 Rh1h7 f6f5 Ng6f4 Bd6xf4
Be3xf4 Rg8xg2) -1.65/10 4} 19. Kb2 {(Kc1b2 Rh8g8 Rd1f1 Rg8g3 Be3d4 f6f5
Bd3b5 Ke8d8 Bd4f6+ Kd8c7) +2.46/9 7} Bc5 {(Bd6c5 Bd3g6+ Ke8d8 Be3xc5 b6xc5
Rd1f1 Ra8b8+ Kb2c1 f6f5 Nh4f3 Rh8xh1 Rf1xh1 Bc8a6 Rh1h8+ Kd8c7 Rh8xb8
Kc7xb8) -1.33/10 8} 20. Bd4 {(Be3d4 Ke8f7 Rd1f1 Bc5xd4 c3xd4 Bc8b7 Nh4f3
Rh8xh1 Rf1xh1 Ra8g8 Rh1h7+ Rg8g7 Rh7xg7+ Kf7xg7 Kb2c3 Kg7f7) +2.26/10 5} e5
{(e6e5 Bd4xc5 b6xc5 Nh4f5 Ra8b8+ Kb2c1 Rh8xh1 Rd1xh1 Ke8d8 Rh1h8+ Kd8c7
Kc1d2 Rb8b6 Bd3e2 Bc8b7 Rh8h7 d5d4 g2g4) -1.65/10 6} 21. Bg6+ {(Bd3g6+
Ke8d8 Bd4xc5 b6xc5 Rd1xd5 Ra8b8+ Kb2c1 Bc8b7 Rd5d1 Bb7c6 Rd1f1 Bc6d5 Kc1d2
Bd5xa2 Bg6e4 Ba2c4 Rf1xf6 Kd8e7 Rf6f3) +2.02/10 6} Kd8 {(Ke8d8 Bd4xc5 b6xc5
Rd1xd5 Bc8b7 Rd5d1 Ra8b8 Kb2a3 Bb7c6 Nh4f3 Rh8xh1 Rd1xh1 Kd8e7 Rh1d1 Rb8h8)
-1.41/10 3} 22. Bxc5 {(Bd4xc5 b6xc5 Rd1xd5 Ra8b8+ Kb2c1 Bc8b7 Rd5d1 Kd8c7
Bg6f7 Bb7c6 Rd1f1 Bc6e4 Kc1d2 Rb8b6) +1.85/11 3} bxc5 {(b6xc5 Rd1xd5 Bc8b7
Rd5d1 Ra8b8 Kb2a3 Kd8c7 c3c4 Rb8g8 Bg6f5) -1.45/8 0} 23. Rxd5 {(Rd1xd5
Ra8b8+ Kb2c1 Bc8b7 Rd5d1 Bb7c6 Rd1f1 Bc6d5 Kc1d2 Bd5xa2 Bg6e4 Rb8b1 Rf1xb1
Ba2xb1 Rh1xb1 Rh8xh4) +2.02/11 4} Bb7 {(Bc8b7 Rd5d1 Ra8b8 Kb2c1 Kd8c7 Bg6f5
Bb7c6 Kc1d2 Rh8h5 g2g4 Rh5h8 Rh1h3 d7d5) -1.33/11 3} 24. Rdd1 {(Rd5d1 Ra8b8
Kb2c1 Kd8c7 Rh1h2 Rb8g8 Bg6f5 Bb7c6 Rh2h3 Rg8g5 g2g4 e5e4 Kc1d2 d7d5 Kd2e3)
+1.81/11 9} Rb8 {(Ra8b8 Kb2c1 Kd8c7 Bg6f5 d7d6 Nh4f3 e5e4 Rh1xh8 Rb8xh8
Nf3d2 d6d5 Nd2b3) -1.49/11 5} 25. Kc1 {(Kb2c1 Kd8c7 Bg6f5 d7d6 Rh1h3 Rb8g8
c3c4 Bb7c6 g2g4 Bc6d7 Kc1b2 Bd7xf5 g4xf5) +1.97/11 3} Kc7 {(Kd8c7 Bg6f5
Bb7c6 Rh1h3 d7d5 Nh4g6 Rh8xh3 g2xh3 Kc7d6 h3h4 d5d4 Kc1d2 Bc6d5 c3xd4
c5xd4) -1.37/11 2} 26. Bf5 {(Bg6f5 d7d6 Rh1h3 Rb8g8 c3c4 Bb7c6 Bf5e6 Bc6d7
Be6xg8 Bd7xh3 g2xh3 Rh8xg8) +2.06/11 11} Bc6 {(Bb7c6 Nh4g6) -2.06/12 19}
27. Ng6 {(Nh4g6 Rh8xh1 Rd1xh1 Bc6xg2 Rh1h7 Rb8d8 Rh7f7 Bg2d5 Rf7xf6 d7d6
Bf5e6 Bd5xe6 Rf6xe6) +1.77/10 5} Rxh1 {(Rh8xh1 Rd1xh1 Rb8d8 Rh1h7 Bc6d5
a2a3 Bd5g8 Rh7h2 Bg8e6 Bf5xe6 d7xe6 Rh2h7+ Rd8d7 Rh7xd7+ Kc7xd7 Kc1d2)
-2.10/11 4} 28. Rxh1 {(Rd1xh1 Bc6xg2 Rh1h7 Rb8d8 Rh7f7 Bg2d5 Rf7xf6 d7d6
Bf5e6 Bd5xe6) +1.69/8 0} Rd8 {(Rb8d8 Rh1h7 Bc6xg2 Rh7f7 Bg2d5 Rf7xf6 d7d6
a2a3 Rd8e8 Kc1d2 a7a5 Rf6f8 Re8xf8 Ng6xf8 Kc7c6 Kd2e3) -2.02/11 2} 29. Rh2
{(Rh1h2 Bc6d5 a2a3 Kc7d6 Kc1d2 Bd5e6 g2g4 Rd8g8 Rh2h7 a7a5 Kd2e3 Rg8b8
Ke3e4 Be6d5+ Ke4e3) +2.42/11 3} Bd5 {(Bc6d5 a2a4 Kc7d6 Kc1d2 Bd5e6 g2g4
Be6xf5 g4xf5 Kd6d5 Rh2h4 Kd5d6 Rh4h7 Rd8g8 Kd2e3) -2.22/10 7} 30. a3 {(a2a3
Bd5e6 g2g4 Rd8g8 Rh2h7 Kc7d6 Kc1d2 a7a5 Kd2e3 Rg8b8 c3c4 Rb8b2 Bf5xe6 d7xe6
Ke3d3) +2.54/12 7} Bf7 {(Bd5f7 Kc1d2 Kc7d6 Rh2h7 Bf7e6 g2g4 Rd8g8 Kd2e3
Be6xf5 g4xf5 Rg8b8) -2.22/9 3} 31. Rh6 {(Rh2h6 Bf7c4 Kc1d2 Kc7d6 Ng6h4
Kd6e7 Rh6h7+ Ke7d6 Nh4f3 Bc4e6 Bf5xe6 Kd6xe6) +2.94/10 5} Be6 {(Bf7e6
Bf5xe6 d7xe6 Ng6h4 Rd8f8 Kc1d2 Kc7d6 Kd2e3 Kd6d5 Rh6h7 Rf8g8 Rh7xa7 Rg8g3+
Ke3d2) -2.50/9 3} 32. Nh4 {(Ng6h4 Rd8f8 Kc1d2 a7a5 g2g4 Kc7d6 Kd2e3 c5c4
Nh4f3 Be6xf5 g4xf5 Kd6d5 Nf3d2) +2.90/11 3} Rf8 {(Rd8f8 Bf5xe6 d7xe6 Kc1d2
Kc7d6 Kd2e3 Kd6d5 Nh4f3 Kd5c4 Nf3d2+ Kc4xc3 Nd2e4+ Kc3xc2 Ne4xc5) -2.38/10
4} 33. Kd2 {(Kc1d2 Kc7c6 g2g4 Kc6b5 Kd2d3 Kb5a4 Rh6h7 c5c4+ Kd3e3 Ka4xa3
Bf5xe6 d7xe6 Rh7xa7+ Ka3b2) +2.90/10 3} Kd6 {(Kc7d6 Bf5d3 c5c4 Bd3f5 Kd6c5
Kd2e3 Be6xf5 Nh4xf5 Rf8g8 g2g3) -2.22/9 2} 34. Kd3 {(Kd2d3 c5c4+ Kd3e3
Kd6d5 g2g4 Kd5c5 Nh4f3 Be6xf5 g4xf5 d7d5 Rh6h7 a7a5) +2.74/9 4} c4+ {(c5c4+
Kd3e3 Kd6d5 g2g4 Kd5d6 Nh4f3 Kd6d5 Nf3d2 Be6xf5 g4xf5 d7d6) -2.58/8 2} 35.
Ke4 {(Kd3e4 a7a6 Nh4f3 Be6d5+ Ke4e3 Bd5e6 Bf5xe6 d7xe6 g2g4) +2.98/11 4}
Bd5+ {(Be6d5+ Ke4e3 Bd5c6 Nh4f3 Kd6c5 Rh6h7 Rf8g8 g2g4 a7a6 Rh7h6 Rg8f8)
-2.58/9 2} 36. Ke3 {(Ke4e3 Bd5e6 g2g4 Kd6c5 Nh4f3 Be6xf5 g4xf5 d7d5)
+2.94/6 0} Be6 {(Bd5e6 g2g4 a7a5 Bf5xe6 Kd6xe6 Nh4f3 Ke6d5 Rh6h7 Kd5e6
Ke3e4 d7d5+ Ke4e3) -2.46/10 2} 37. g4 {(g2g4 a7a6 Bf5xe6 d7xe6 Nh4f3 Rf8g8
Rh6xf6 Rg8xg4 Rf6f8 Rg4g2 Rf8d8+ Kd6e7 Rd8d2) +2.94/11 2} a5 {(a7a5 Bf5xe6
d7xe6 Nh4f3 Kd6d5 Rh6h1 Rf8g8 Rh1d1+ Kd5c5 g4g5 f6f5 Nf3xe5 Rg8xg5)
-2.94/10 6} 38. Bxe6 {(Bf5xe6 d7xe6 Nh4f3 Rf8g8 g4g5 f6f5 g5g6 Kd6d5 Nf3g5
Rg8g7 Ng5f7 a5a4 Ke3f3) +3.15/10 3} Kxe6 {(Kd6xe6 Nh4f5 Ke6d5 Nf5g7 Kd5d6
g4g5 Kd6e7 Ke3e4 f6xg5 Ke4xe5 Ke7f7 Ng7f5) -3.19/10 5} 39. Nf5 {(Nh4f5
Ke6d5 Rh6h7 Rf8d8 Ke3f3 a5a4 Rh7f7 Kd5e6 Rf7e7+ Ke6d5 Re7h7 d7d6) +3.27/9
2} Rc8 {(Rf8c8 Ke3f3 Rc8f8 Rh6h7 Rf8f7 Rh7xf7 Ke6xf7 Nf5d6+ Kf7e6 Nd6xc4
a5a4 Nc4b6) -3.23/10 2} 40. Ng7+ {(Nf5g7+ Ke6f7 Ng7h5 Rc8c6 Rh6h7+ Kf7e6
Nh5g7+ Ke6d5 Rh7h6 a5a4 Ng7e8 f6f5 g4g5 Rc6c8 Ne8f6+) +3.63/9 2} Kf7
{(Ke6f7 Ng7h5 Rc8c6 Rh6h7+ Kf7e6 Nh5g7+ Ke6d5 Rh7h6 f6f5 Ng7xf5 Rc6xh6
Nf5xh6 d7d6) -3.27/9 1} 41. Nh5 {(Ng7h5 Rc8c6 Nh5g3 Rc6c7 a3a4 Kf7e7 Ng3f5+
Ke7e6 Rh6h8 Rc7a7 Rh8b8 d7d6) +3.51/10 2} Rc6 {(Rc8c6 Rh6h7+ Kf7e6 Nh5g7+
Ke6d5 Rh7h6 a5a4 Ng7h5 f6f5 g4g5 d7d6 Nh5f6+ Kd5e6 Nf6e4+ Ke6d5 Ne4d2)
-3.27/10 1} 42. Rh7+ {(Rh6h7+ Kf7e6 Nh5g7+ Ke6d5 Rh7h6 a5a4 Ng7e8 f6f5 g4g5
Rc6c8 Ne8f6+ Kd5e6 Nf6e4+ Ke6e7 Ne4d6) +4.00/11 2} Ke6 {(Kf7e6 a3a4 Rc6c8
Rh7h6 Rc8f8 g4g5 Ke6f5 Rh6xf6+ Rf8xf6 Nh5xf6 Kf5xg5 Nf6xd7 Kg5f5 Nd7c5)
-3.91/11 5} 43. Ng7+ {(Nh5g7+ Ke6d5 Rh7h6 f6f5 Ng7xf5 Rc6xh6 Nf5xh6 Kd5e6
g4g5 d7d5 Ke3f3) +4.88/11 8} Kd5 {(Ke6d5 Rh7h1 Kd5d6 Rh1h6 Kd6e7 Rh6h7
Ke7d6 Ng7f5+ Kd6c7 Nf5e7 Rc6e6 Ne7d5+ Kc7d6) -3.75/10 2} 44. Rh6 {(Rh7h6
Rc6c8 Ng7h5 Kd5e6 Rh6xf6+ Ke6e7 Rf6b6 Rc8f8 Ke3e4 Rf8f2 Ke4xe5 Rf2xc2)
+4.92/11 2} a4 {(a5a4 Ng7h5 f6f5 g4g5 Rc6c8 Nh5f6+ Kd5e6 Ke3f3 Ke6e7 Nf6d5+
Ke7f7 Rh6f6+ Kf7g7 Rf6xf5 d7d6) -4.24/10 2} 45. Ne8 {(Ng7e8 f6f5 g4g5 Rc6c8
Rh6h8 Rc8c6 Ne8f6+ Rc6xf6 g5xf6 Kd5e6 Rh8c8 f5f4+ Ke3f3 Ke6xf6 Rc8xc4 Kf6f5
Rc4xa4 d7d5) +5.53/12 4} f5 {(f6f5 g4g5 Rc6c8 Ne8f6+ Kd5e6 Ke3f3 Rc8b8
Nf6g4+ Ke6d5 Ng4e3+ Kd5c5 Ne3xf5 Rb8f8) -4.40/9 1} 46. g5 {(g4g5 Rc6c8
Rh6h8 Rc8c6 Ne8f6+ Rc6xf6 g5xf6 Kd5e6 Rh8d8 d7d6 f6f7 Ke6xf7 Rd8xd6 Kf7e7
Rd6c6 f5f4+ Ke3e4) +5.41/9 1} Rc8 {(Rc6c8 Ne8f6+ Kd5e6 Ke3f3 Rc8b8 Nf6g4+
Ke6d5 Ng4e3+ Kd5c5 Ne3xf5 Rb8b2 g5g6 Rb2xc2 g6g7 Rc2xc3+ Kf3e4) -4.84/10 1}
47. Rh8 {(Rh6h8 Rc8c6 Ne8f6+ Rc6xf6 g5xf6 Kd5e6 Rh8d8 Ke6xf6 Rd8xd7 Kf6e6
Rd7a7 Ke6d5 Ra7a5+ Kd5e6 Ra5xa4) +5.89/11 2} f4+ {(f5f4+ Ke3f3 Rc8c6 Rh8h6
Rc6c8 Ne8f6+ Kd5e6 Kf3e4 f4f3 Nf6d5+ Ke6f7 Rh6f6+ Kf7g7 Rf6xf3 d7d6)
-5.29/9 2} 48. Kf3 {(Ke3f3 Rc8c6 Ne8f6+ Kd5e6 Rh8e8+ Ke6f5 Nf6xd7 Kf5xg5
Re8xe5+ Kg5h6 Re5e4 Rc6d6 Nd7e5 Rd6d2 Re4xc4 Kh6g5 Rc4xf4 Rd2xc2) +6.02/11
2} Rc6 {(Rc8c6 Rh8h6 Rc6c8 Ne8f6+ Kd5e6 Kf3e4 d7d6 Nf6e8+ Ke6e7 Ne8xd6
Rc8g8 Ke4xe5 Rg8xg5+ Ke5xf4) -5.57/10 1} 49. Nf6+ {(Ne8f6+ Kd5e6 Rh8e8+
Ke6f5 Nf6xd7 Kf5xg5 Re8xe5+ Kg5h6 Re5e4 Rc6d6 Nd7e5 Rd6d2 Kf3xf4 Rd2f2+
Kf4e3 Rf2xc2 Re4xc4 Kh6g5 Rc4g4+ Kg5f5) +6.02/11 2} Ke6 {(Kd5e6 Rh8e8+
Ke6f5 Nf6xd7 Kf5xg5 Re8xe5+ Kg5h4 Nd7c5 Rc6g6 Re5e8 Rg6g3+ Kf3xf4 Rg3g4+
Kf4e3 Rg4g2 Re8e4+ Kh4g5 Nc5xa4 Rg2xc2 Re4xc4) -5.89/10 1} 50. Re8+
{(Rh8e8+ Ke6f5 Nf6xd7 Kf5xg5 Re8xe5+ Kg5g6 Kf3xf4 Rc6d6 Re5g5+ Kg6h6 Nd7e5
Rd6d2 Ne5xc4 Rd2f2+ Kf4e3 Rf2xc2) +6.30/10 1} Kf5 {(Ke6f5 Nf6xd7 Kf5xg5
Re8xe5+ Kg5g6 Kf3xf4 Rc6d6 Re5g5+ Kg6h6 Nd7e5 Rd6d2 Rg5g3 Rd2xc2 Ne5xc4
Kh6h5 Rg3g5+ Kh5h4) -5.97/11 2} 51. Nxd7 {(Nf6xd7 Kf5xg5 Re8xe5+ Kg5g6
Kf3xf4 Rc6d6 Re5g5+ Kg6h6 Nd7e5 Rd6d2 Ne5g4+ Kh6h7 Ng4e3 Rd2f2+ Kf4g3 Rf2e2
Kg3f3 Re2h2 Kf3e4 Kh7h6) +6.34/10 1} Kxg5 {(Kf5xg5 Re8xe5+ Kg5h6 Re5e4
Rc6d6 Nd7e5 Rd6d2 Kf3xf4 Rd2xc2 Re4xc4 Kh6h5) -5.93/10 1} 52. Rxe5+
{(Re8xe5+ Kg5h6 Kf3xf4 Rc6d6 Nd7c5 Rd6d2 Re5e4 Rd2xc2 Re4xc4 Kh6g6 Nc5e4
Rc2e2 Rc4xa4) +6.58/10 3} Kh6 {(Kg5h6 Re5e4 Rc6d6 Re4d4 Rd6e6 Rd4xf4 Kh6g5)
-6.22/11 3} 53. Kxf4 {(Kf3xf4 Rc6d6 Nd7c5 Rd6d1 Re5e6+ Kh6g7 Re6a6 Rd1d2
Ra6xa4 Rd2xc2 Ra4xc4 Kg7f6 Nc5e4+ Kf6e6 Rc4c6+ Ke6d5) +6.70/11 3} Rd6
{(Rc6d6 Nd7c5 Rd6d1 Re5e6+ Kh6g7 Re6a6 Rd1d2 Ra6xa4 Rd2xc2 Ra4xc4 Kg7g6)
-6.26/9 1} 54. Nc5 {(Nd7c5 Rd6d2 Re5e4 Rd2f2+ Kf4e5 Rf2xc2 Re4xc4 Kh6g6
Nc5e4 Rc2b2 Rc4xa4 Rb2b5+ Ke5d4) +6.86/11 2} Rd1 {(Rd6d1 Re5e6+ Kh6h5 Re6a6
Rd1f1+ Kf4e5 Rf1f3 Ke5d4 Rf3f4+ Kd4d5 Kh5g4 Ra6xa4) -6.38/9 2} 55. Re6+
{(Re5e6+ Kh6g7) +7.03/9 2} Kh5 {(Kh6h5 Re6a6) -6.62/10 2} 56. Ra6 {(Re6a6
Rd1c1 Ra6xa4 Rc1xc2 Ra4xc4 Rc2a2 Rc4a4 Ra2c2 c3c4) +7.07/9 1} Rc1 {(Rd1c1
Ra6xa4) -6.78/10 2} 57. Rxa4 {(Ra6xa4 Rc1f1+ Kf4e5 Rf1a1 Ke5d5 Ra1a2 Nc5e6
Ra2xc2 Ra4xc4 Rc2f2 a3a4 Rf2f5+ Kd5d6) +7.43/9 1} Ra1 {(Rc1a1 Kf4e5 Kh5g6
Ke5d4 Ra1g1 Kd4xc4 Rg1g2 Kc4d3 Kg6f5) -7.11/9 2} 58. Ne4 {(Nc5e4 Kh5g6
Ra4a6+ Kg6g7) +7.59/9 2} Kg6 {(Kh5g6 Ra4a6+) -7.27/8 2} 59. Ra6+ {(Ra4a6+
Kg6g7 a3a4 Ra1a2 a4a5 Ra2xc2 Ra6f6 Rc2a2 a5a6 Ra2a5 Kf4e3) +7.91/9 2} Kf7
{(Kg6f7 Ne4d6+ Kf7e6 Nd6xc4+ Ke6d5 Nc4e3+ Kd5c5 Ra6a5+ Kc5c6 a3a4 Ra1e1
Ra5h5) -7.43/9 1} 60. Nd6+ {(Ne4d6+ Kf7e6 Nd6xc4+ Ke6d5 Nc4e3+ Kd5c5 Ra6a5+
Kc5b6 Ra5h5 Kb6c6 Ne3c4) +8.16/7 1} Ke6 {(Kf7e6 Nd6xc4+ Ke6d5 Nc4e3+ Kd5c5
Ra6a5+ Kc5c6 c3c4 Ra1h1 Ne3f5 Rh1f1+ Kf4e5 Kc6c7) -7.55/8 1} 61. Nxc4+
{(Nd6xc4+ Ke6d5 Nc4e3+ Kd5c5 c3c4 Ra1h1 Ra6a5+ Kc5c6 Kf4e4 Rh1h4+ Ke4e5
Rh4h3 Ne3d5) +8.40/8 1} Kd5 {(Ke6d5 Nc4e3+ Kd5c5 Ra6a5+ Kc5c6 c3c4 Ra1h1
Ne3f5 Rh1f1+ Kf4e4 Rf1e1+ Nf5e3 Re1e2) -7.59/9 1} 62. Ne3+ {(Nc4e3+ Kd5c5
c3c4 Ra1h1 Ra6a5+ Kc5c6 Ne3f5 Rh1f1+ Kf4e4 Rf1e1+ Nf5e3 Re1h1 Ra5d5 Rh1h4+
Ke4d3 Rh4h3 a3a4) +8.40/9 1} Kc5 {(Kd5c5 c3c4 Ra1h1 Ra6a5+ Kc5c6 Ra5g5
Rh1e1) -7.51/6 0} 63. c4 {(c3c4 Ra1h1 Ra6a5+ Kc5c6 Ne3f5 Rh1d1 a3a4 Rd1f1+
Kf4e4 Rf1e1+ Nf5e3 Re1a1 Ne3d5 Ra1e1+ Ke4d4) +8.60/9 2} Rh1 {(Ra1h1 Ra6a5+
Kc5c6 Ne3f5 Rh1f1+ Kf4e4 Rf1e1+ Nf5e3 Re1h1 Ra5f5 Rh1h4+ Rf5f4 Rh4h3)
-7.63/9 1} 64. Ra5+ {(Ra6a5+ Kc5c6 Ne3f5 Rh1f1+ Kf4e4 Rf1e1+ Ke4d4 Re1d1+
Kd4c3 Rd1a1 Nf5d4+ Kc6b6 Ra5b5+ Kb6c7 Kc3b4 Kc7d6 Rb5d5+ Kd6e7) +8.72/10 3}
Kc6 {(Kc5c6 Ne3f5) -7.79/9 2} 65. a4 {(a3a4 Rh1a1) +8.92/9 3} Ra1 {(Rh1a1
Kf4e4 Kc6b6 Ra5b5+ Kb6a6 Rb5b4 Ka6a5 c2c3 Ra1xa4 c4c5 Ra4a1 Ne3c4+ Ka5a6)
-7.87/9 2} 66. Ke4 {(Kf4e4 Ra1a3 Ne3d5 Ra3g3 Nd5b4+ Kc6c7 Ra5f5 Rg3g4+
Ke4d5 Kc7b6 Nb4d3 Kb6c7) +9.09/10 2} Ra3 {(Ra1a3 Ne3d5 Ra3h3 Ra5b5 Rh3h4+
Ke4d3 Rh4h3+ Kd3d4 Rh3h4+ Kd4c3 Rh4h3+ Kc3b4 Kc6d6 Rb5b6+ Kd6e5) -8.28/9 1}
67. Nd5 {(Ne3d5 Ra3h3 Nd5b4+ Kc6b7 Ra5b5+ Kb7c7 Nb4d5+ Kc7c6 a4a5 Rh3h4+
Ke4d3 Rh4h3+ Kd3d4 Rh3h4+ Kd4c3 Rh4h3+ Kc3d2) +9.17/9 2} Rg3 {(Ra3g3 Ra5b5)
-8.56/9 2} 68. Nb4+ {(Nd5b4+ Kc6d7 Ra5f5 Kd7e6 a4a5 Rg3c3 Rf5f6+ Ke6d7
Ke4d4) +9.49/8 1} Kc7 {(Kc6c7 Ra5f5 Rg3g4+ Rf5f4 Rg4g7 Nb4d5+ Kc7c6 Ke4d4
Rg7g2 Rf4f6+ Kc6d7) -8.64/8 1} 69. Rf5 {(Ra5f5 Rg3g4+ Rf5f4 Rg4g7 c4c5
Kc7b7 a4a5 Rg7e7+ Ke4d4 Re7g7 Nb4d5 Rg7g5) +9.69/9 2} Rg4+ {(Rg3g4+ Rf5f4
Rg4g7 a4a5 Kc7b7 c4c5 Rg7h7 a5a6+ Kb7a7 c5c6 Rh7c7) -8.76/8 1} 70. Rf4
{(Rf5f4 Rg4g7) +10.10/9 3} Rg7 {(Rg4g7 a4a5 Kc7b7 c4c5 Rg7h7 Ke4d5 Rh7h5+
Kd5d4 Rh5h7 a5a6+ Kb7a7 c5c6) -9.13/8 2} 71. Nd5+ {(Nb4d5+ Kc7c6 Ke4d4
Rg7g2 a4a5 Kc6b7 Rf4f6 Rg2g4+ Kd4c3 Rg4g3+ Kc3b4 Rg3g2 Rf6b6+ Kb7a7)
+9.85/8 1} Kc6 {(Kc7c6 Ke4d4 Rg7g2 a4a5 Kc6b7 Rf4f6 Rg2d2+ Kd4c5 Rd2g2)
-9.21/8 2} 72. Kd4 {(Ke4d4 Rg7g2) +10.02/10 2} Rg1 {(Rg7g1 Rf4f6+ Kc6b7
a4a5 Rg1g4+ Kd4c5 Rg4g7 Rf6b6+ Kb7a7 Kc5b5 Rg7d7 Rb6f6 Rd7b7+ Kb5c5 Rb7g7
Kc5d4 Rg7g4+ Rf6f4 Rg4xf4+ Nd5xf4) -9.33/8 1} 73. Rf6+ {(Rf4f6+ Kc6b7)
+10.22/8 1} Kb7 {(Kc6b7 a4a5 Rg1g7 Rf6b6+ Kb7a7 c4c5 Rg7g4+ Kd4d3 Rg4g5
Kd3c4 Rg5g4+) -9.57/8 1} 74. Rf7+ {(Rf6f7+ Kb7b8 a4a5 Rg1a1 Nd5b4 Ra1d1+
Kd4c5 Rd1a1 a5a6 Ra1a5+ Kc5d4) +10.26/7 2} Ka6 {(Kb7a6 c4c5 Rg1g4+ Rf7f4
Rg4g5 c2c4 Ka6a5 c5c6 Rg5g8 c6c7 Rg8c8) -9.85/7 1 Black resigns} *
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- Posts: 10309
- Joined: Thu Mar 09, 2006 12:37 am
- Location: Tel-Aviv Israel
Re: Too high penalty?
I disagreeRalph Stoesser wrote:The second position is no good example for possibly too high double/isolated pawn penalty. As long as the engine does not see that Bxf3 loses material and the game, she will play it regardless how high the double/isolated pawn penalty is. Apart from this SF 1.8 sees very fast that Bxf3 loses. This blunder can only be played under heavy time pressure.
SF1.8 does not play Bxf3 at small depths except depth 5 and it suggests Rb2 at depth 1.
f3 is more advanced pawn then g4 so programs can certainly reject Bxf3 based on evaluation.
New game, Friend mode
8/8/8/3B1pk1/2K3p1/5nP1/4RP2/5r2 w - - 0 1
Analysis by Stockfish 1.8 JA:
1.Re2-b2
² (0.56) Depth: 1 00:00:00
1.Re2-b2 Rf1-c1+ 2.Kc4-d3 Rc1-d1+ 3.Kd3-c4
= (0.24) Depth: 2 00:00:00
1.Re2-a2 Rf1-c1+ 2.Kc4-b4
² (0.40) Depth: 2 00:00:00
1.Kc4-c5 Rf1-d1
² (0.44) Depth: 2 00:00:00
1.Kc4-c5 Rf1-d1 2.Bd5-c4
² (0.44) Depth: 3 00:00:00
1.Kc4-c5 Rf1-c1+ 2.Bd5-c4 f5-f4 3.g3xf4+ Kg5xf4
² (0.28) Depth: 4 00:00:00
1.Re2-c2 Rf1-d1 2.Bd5xf3 g4xf3
² (0.32) Depth: 4 00:00:00
1.Re2-c2 f5-f4 2.Kc4-c5 Rf1-d1 3.Bd5xf3 g4xf3
² (0.40) Depth: 5 00:00:00
1.Bd5xf3 Rf1-c1+ 2.Kc4-d3 g4xf3 3.Re2-e5 Rc1-d1+ 4.Kd3-c4
² (0.68) Depth: 5 00:00:00
1.Bd5xf3 g4xf3
= (0.24) Depth: 6 00:00:00 6kN
1.Re2-c2 f5-f4 2.Kc4-c5 Rf1-d1 3.Rc2-c4 f4xg3 4.f2xg3
² (0.48) Depth: 6 00:00:01 7kN
1.Re2-c2 f5-f4 2.g3xf4+ Kg5xf4 3.Kc4-c5 Nf3-e5 4.Kc5-d6 Rf1-d1
² (0.40) Depth: 7 00:00:01 10kN
1.Re2-c2 f5-f4 2.g3xf4+ Kg5xf4 3.Kc4-c5 Nf3-e1 4.Rc2-d2 Ne1-d3+ 5.Rd2xd3 Rf1xf2 6.Rd3-d4+ Kf4-g5
² (0.48) Depth: 8 00:00:01 21kN
1.Re2-c2 f5-f4 2.g3xf4+ Kg5xf4 3.Kc4-c5 Nf3-e1 4.Rc2-d2 Ne1-d3+ 5.Rd2xd3 Rf1xf2 6.Rd3-d4+ Kf4-g5
² (0.48) Depth: 9 00:00:01 24kN
1.Re2-c2 f5-f4
² (0.40) Depth: 10 00:00:01 35kN
1.Re2-c2 f5-f4 2.g3xf4+ Kg5xf4 3.Kc4-c5 Rf1-a1 4.Rc2-c4+ Kf4-f5 5.Rc4-b4 Ra1-c1+ 6.Kc5-d6 Rc1-d1 7.Rb4-e4
² (0.40) Depth: 10 00:00:01 43kN
1.Re2-c2 f5-f4
² (0.32) Depth: 11 00:00:01 54kN
1.Re2-c2 f5-f4
= (0.24) Depth: 11 00:00:01 104kN
1.Kc4-c5 Rf1-c1+ 2.Kc5-d6 Rc1-d1 3.Re2-b2 Kg5-f6 4.Rb2-a2 Rd1-d2 5.Ra2xd2 Nf3xd2 6.Bd5-c6 Nd2-c4+ 7.Kd6-d5 Nc4-e5
² (0.32) Depth: 11 00:00:01 109kN
1.Kc4-c5 Rf1-c1+ 2.Kc5-d6 Rc1-d1 3.Re2-b2 Kg5-f6 4.Rb2-a2 Rd1-d2 5.Ra2xd2 Nf3xd2 6.Bd5-c6 Nd2-e4+ 7.Bc6xe4 f5xe4 8.Kd6-d5 Kf6-f5
² (0.32) Depth: 12 00:00:01 127kN
1.Kc4-c5 Rf1-c1+
= (0.24) Depth: 13 00:00:01 154kN
1.Kc4-c5 Rf1-c1+
= (0.16) Depth: 13 00:00:02 234kN
1.Kc4-c5 Rf1-c1+ 2.Kc5-b4 Rc1-d1 3.Bd5xf3 g4xf3 4.Re2-c2 Rd1-d7 5.Kb4-a4 Rd7-e7 6.Rc2-c3 Re7-e2 7.Rc3xf3 Re2-d2
= (0.12) Depth: 13 00:00:02 425kN
1.Kc4-c5 Rf1-c1+ 2.Kc5-b4 Rc1-d1 3.Kb4-c5 Rd1-c1+
= (0.00) Depth: 14 00:00:02 682kN
1.Kc4-c5 Rf1-c1+ 2.Kc5-b4 Rc1-d1 3.Kb4-c5 Rd1-c1+
= (0.00) Depth: 15 00:00:03 1320kN
1.Kc4-c5 Rf1-c1+ 2.Kc5-b4 Rc1-d1 3.Kb4-c5 Rd1-c1+
= (0.00) Depth: 16 00:00:05 1499kN
(, 09.07.2010)
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- Posts: 1136
- Joined: Sun Feb 14, 2010 10:02 pm
Re: Too high penalty?
I think that my proposition (mobility and safety) can be good for this issue, but of course, in the mix with the original variables: doubled, isolated ........
It is not easy to do it correctly.
It is not easy to do it correctly.