Let's explore an idea

[Mike Sherwin]

Bricabrac without any reductions.

FEN: rnbqkbnr/pppppppp/8/8/3P4/8/PPP1PPPP/RNBQKBNR b KQkq d3 0 1

Bricabrac:
1 00:00 20 20 +0.33 b1c3
2 00:00 218 218 +0.12 e2e4 d7d5
3 00:00 974 974 +0.34 d2d4 b8c6 e2e4
4 00:00 6k 6k +0.18 g1f3 d7d5 d2d4 e7e6
5 00:00 21k 21k +0.18 g1f3 d7d5 d2d4 g8f6 e2e3
6 00:00 153k 15,350k +0.16 e2e4 g8f6 e4e5 f6e4 d2d3 e4c5
7 00:00 628k 15,688k +0.20 e2e4 b8c6 g1f3 g8f6 e4e5 f6e4 d2d4
8 00:00 2,860k 10,593k +0.26 e2e4 b8c6 d2d4 g8f6 e4e5 f6d5 g1f3 e7e6
9 00:01 16,363k 13,523k +0.19 e2e4 b8c6 d2d4 e7e6 g1f3 d7d5 e4d5 e6d5 c2c3
10 00:12 142,213k 11,714k +0.18 d2d4 g8f6 g1f3 d7d5 b1c3 b8c6 c1f4 e7e6 a1c1 h7h6
11 00:39 531,503k 13,314k +0.14 d2d4 g8f6 g1f3 e7e6 b1c3 f8b4 c1g5 e8g8 e2e4 b8c6 h2h3

This is the basic most idea.

Code: Select all

    if (depth > 3) {
      mov->score = -Search(t, m + n, -beta, -alpha, depth - 3);
      if (mov->score > alpha && mov->score < beta)
      mov->score = -Search(t, m + n, -beta, -alpha, depth - 1);
    }
    else {
      mov->score = -Search(t, m + n, -beta, -alpha, depth - 1);
    }

Bricabrac with just this one idea for reduction.

FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1

Bricabrac:
1 00:00 20 20 +0.33 b1c3
2 00:00 218 218 +0.12 e2e4 d7d5
3 00:00 974 974 +0.34 d2d4 b8c6 e2e4
4 00:00 6k 6k +0.18 g1f3 d7d5 d2d4 e7e6
5 00:00 8k 8k +0.18 g1f3 d7d5 d2d4 g8f6 e2e3
6 00:00 18k 18k +0.14 b1c3 g8f6 e2e4 d7d5 e4d5 f6d5
7 00:00 35k 35k +0.18 b1c3 g8f6 g1f3 d7d5 d2d4 b8c6 e2e3
8 00:00 63k 63k +0.17 b1c3 g8f6 e2e4 b8c6 g1f3 d7d5 e4d5 f6d5
9 00:00 192k 19,224k +0.22 b1c3 g8f6 d2d4 d7d5 c1f4 c8f5 c3b5 b8a6 e2e3
10 00:00 408k 13,604k +0.18 b1c3 g8f6 g1f3 d7d5 d2d4 b8c6 c1f4 e7e6 a1c1 h7h6
11 00:00 1,199k 11,991k +0.30 b1c3 g8f6 e2e4 b8c6 g1f3 e7e5 f1b5 f8d6 b5c6 d7c6 e1g1
12 00:00 2,300k 12,104k +0.11 b1c3 g8f6 g1f3 d7d5 d2d4 b8c6 c1e3 c8e6 a1c1 h7h6 h2h3 a7a6
13 00:00 3,994k 12,481k +0.09 b1c3 g8f6 g1f3 d7d5 d2d4 b8c6 c1e3 c8e6 a1c1 a8c8 h2h3 h7h6 a2a3
14 00:00 6,884k 12,294k +0.18 b1c3 g8f6 g1f3 d7d5 d2d4 b8c6 f3e5 c8e6 e5c6 b7c6 c1f4 g7g6 f4e5 f8g7
15 00:01 12,972k 12,238k +0.07 b1c3 g8f6 g1f3 d7d5 d2d4 c8f5 c1e3 b8c6 a1c1 a8c8 h2h3 e7e6 g2g3 f8d6 f1g2
16 00:02 31,007k 11,880k +0.14 b1c3 g8f6 g1f3 d7d5 d2d4 b8c6 c1f4 c8e6 a1c1 a8c8 e2e3 f6h5 f4g5 h7h6 g5h4 a7a6
17 00:05 61,884k 11,993k +0.09 b1c3 g8f6 g1f3 d7d5 d2d4 b8c6 c1e3 c8e6 a1c1 a8c8 h2h3 h7h6 a2a3 g7g6 g2g3 f8g7 f1g2
18 00:11 135,566k 11,799k +0.10 b1c3 g8f6 g1f3 d7d5 d2d4 c8e6 c1f4 b8c6 e2e3 f6h5 f4g5 h7h6 g5h4 g7g6 f1d3 f8g7 e1g1 e8g8
19 00:23 281,382k 11,969k +0.35 e2e4 g8f6 e4e5 f6d5 g1f3 c7c5 b1c3 d5c3 d2c3 d7d5 c1e3 e7e6 f1b5 b8c6 e1g1 c8d7 a2a4 a8c8 h2h3

Game against TSCP. Bric does not know to move its king toward the center in the endgame yet. And note, Bric is still just material + pst. The pst's are PESTO.

[pgn][Event "Stafford.at"]
[Site "DESKTOP-HFVHK2B"]
[Date "2021.03.02"]
[Round "1"]
[White "Bricabrac"]
[Black "Tscp181"]
[Result "1/2-1/2"]
[BlackElo "2200"]
[ECO "A70"]
[Opening "Benoni"]
[Time "16:20:16"]
[Variation "Classical, 8.Bd3"]
[WhiteElo "2200"]
[TimeControl "0+8"]
[Termination "normal"]
[PlyCount "108"]
[WhiteType "human"]
[BlackType "human"]

1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8.
Bd3 {(f1d3 e8g8 e1g1 c8g4 c1f4 d8b6 a1c1 f8d8 b2b3 b8d7 c3a4 b6c7 h2h3 g4h5
a2a3) +0.63/15 7} Bg4 {(c8g4 e1g1 d8b6 c3a4 b6b4 a4c3 e8g8) -0.76/7 7} 9.
O-O {(e1g1 e8g8 c1f4 b8a6 a2a3 a8c8 c3b5 c5c4 b5d6 c4d3 d6c8 g4c8 d1d3
a6c5) +0.78/14 7} Qb6 {(d8b6 a1b1 b8d7 c3a4 b6a5 a4c3 g4f3 d1f3) -0.67/6 7}
10. a4 {(a2a4 e8g8 a4a5 b6c7 c1e3 b8d7 c3b5 c7b8 a5a6 b7a6 a1a6 f6e4 d3e4
b8b5) +0.96/14 7} Nbd7 {(b8d7 a4a5 g4f3 d1f3 b6b4 c3b5 c5c4) -0.54/7 7} 11.
a5 {(a4a5 b6d8 c1e3 e8g8 d3e2 a8c8 h2h3 g4f3 e2f3 d7e5 f3e2 a7a6 f2f4 g7h6
f1e1) +0.69/15 7} Bxf3 {(g4f3 d1f3 b6b3 f3e2 e8g8 c1f4 f6e8) -0.75/7 7} 12.
axb6 {(a5b6 f3d1 a1a7 e8g8 f1d1 c5c4 d3c2 d7b6 a7b7 b6d7 c1f4 a8b8 b7b8
f8b8) +2.09/14 7} Bxd1 {(f3d1 b6a7 d1b3 c3b5 e8g8 b5d6 d7e5 d3b5 f6d5 e4d5
b3d5) -0.94/8 7} 13. Rxa7 {(a1a7 d7b6 a7a8 b6a8 f1d1 a8c7 c1f4 e8d7 c3a4
h8d8 a4b6 d7e8 h2h3 e8f8 f4g3 f8g8) +1.63/16 7} Nxb6 {(d7b6 a7b7 b6d5 e4d5
d1a4 f1e1 e8f8 c1f4 f6e8) -0.95/8 7} 14. Rxa8+ {(a7a8 b6a8 f1d1 a8c7 c1f4
e8e7 e4e5 d6e5 f4e5 c7e8 h2h3 h8f8 g2g3 h7h6 d3c2 c5c4) +1.64/16 7} Nxa8
{(b6a8 c3d1 f6d7 c1f4 g7e5 f4e3 f7f6 b2b3) -0.43/7 7} 15. Rxd1 {(f1d1 e8g8
c1f4 f8d8 c3b5 f6e8 f4g5 e8f6 g5f4 f6e8 f4g5 d8c8 g5e7 a8c7 b5d6 e8d6 e7d6)
+1.56/17 7} Ng4 {(f6g4 c3b5 e8d7 d3e2 g4f6 b5c3 a8c7) -0.41/7 7} 16. Nb5
{(c3b5 e8g8 d3e2 g4f6 b5d6 a8b6 c1e3 b6d7 h2h3 h7h6 e2d3 b7b6 e3f4 f6e8
d6c4 b6b5 c4e3) +2.32/17 7} Kd7 {(e8d7 d3e2 g4f6 b5c3 a8c7 c1e3 h8a8)
-0.51/7 7} 17. h3 {(h2h3 g4f6 c1f4 f6e8 b2b3 a8b6 d3e2 h8f8 e2f3 d7e7 f4g5
e8f6 b5c7 b6d7 g5e3 d7e5) +2.17/16 7} Ne5 {(g4e5 d3e2 a8b6 b2b3 f7f5 e4f5
g6f5 c1f4) -0.43/8 7} 18. Be2 {(d3e2 a8b6 c1e3 h8d8 b2b3 d7e7 d1e1 h7h6
e1d1 d8e8 b5c7 e8c8 c7b5 g6g5 e2g4 e5g4) +1.90/16 7} f6 {(f7f5 e4f5 g6f5
f2f4 e5g6 e2d3 h8f8) -0.35/7 7} 19. f4 {(f2f4 e5f7 c1e3 a8b6 e2g4 d7e7 b5c7
b6c4 e3c1 e7f8 b2b3 c4b6 c1e3 f8g8 g2g3 h7h6 g4e6) +2.15/17 7} Nf7 {(e5f7
e2g4 d7e7 g4e6 f7d8 f4f5 g6f5 e6f5 a8b6) -0.47/8 7} 20. Bg4+ {(e2g4 d7e7
c1e3 a8b6 b5c7 b6c4 e3c1 e7f8 g4e6 f8g8 f4f5 c4e5 c7e8 g6f5 e4f5 e5c4 e8g7)
+2.15/17 7} Ke7 {(d7e7 g4e6 h8d8 c1e3 a8b6 b2b3 h7h5 d1a1) -0.57/7 7} 21.
Be6 {(g4e6 h8f8 c1d2 a8b6 b2b3 b6d7 d2c3 b7b6 b5c7 e7d8 c7b5 d8e7 c3b2 e7e8
e6f7 f8f7 b5d6) +2.33/17 7} Rd8 {(h8d8 d1d3 a8b6 d3a3 b6c4 a3a7 d8b8 b5c3)
-0.60/8 7} 22. Bd2 {(c1d2 e7f8 d2c3 f8g8 f4f5 g6f5 e6f5 h7h6 c3a5 b7b6 a5c3
d8e8 b2b4 c5c4 g2g3) +2.38/15 7} f5 {(f6f5 e4e5 d6e5 d2c3 f7d6 b5a3 a8c7
f4e5 c7e6 d5e6 e7e6 e5d6 g7c3 b2c3 d8d6) -0.28/8 7} 23. exf5 {(e4f5 g7b2
d1e1 b2g7 f5g6 h7g6 f4f5 g6f5 e6f5 e7f8 d2a5 d8e8 f5e6 g7e5 e1f1 e8e7)
+2.89/16 7} Bxb2 {(g7b2 d1b1 b2f6 b5a7 f6d4 g1f1 d8f8 a7c8 e7f6 f5g6 h7g6
b1b7) -0.92/8 7} 24. fxg6 {(f5g6 h7g6 f4f5 e7f6 f5g6 f6g6 d2a5 b7b6 a5e1
b2e5 e1h4 f7g5 h4g5 g6g5 e6f7 c5c4) +2.84/16 7} hxg6 {(h7g6 d1b1 b2f6 b5a7
f6d4 g1h1 d8f8 b1b7 e7e8 a7c6) -0.91/8 7} 25. f5 {(f4f5 g6f5 e6f5 b2e5 f5e4
d8f8 d2a5 e7e8 e4g6 e5g3 a5e1 g3f4 e1d2 f4d2 d1d2) +2.69/15 7} gxf5 {(g6f5
d1b1 b2e5 b5a7 e7f6 b1b7 e5d4 g1h1 f7e5) -0.45/8 7} 26. Rf1 {(d1f1 b2e5
f1f5 d8f8 d2a5 e7e8 g1h1 c5c4 h1g1 e5g3 f5f6 f7g5 f6f8 e8f8 b5d4 f8e8 d4f5)
+2.70/17 7} Bf6 {(d8f8 f1f5 b2e5 d2f4 f7h8 f4e5 f8f5 e5h8) -0.45/7 7} 27.
Rxf5 {(f1f5 f7e5 d2a5 b7b6 a5c3 e5d7 g2g3 f6e5 g1g2 c5c4 c3d4 e5f6 d4c3
f6e5 c3b4 d7c5 f5f7) +3.37/17 7} Ne5 {(f7e5 d2e1 c5c4 f5f6 a8c7 b5c7 e7f6
g2g4) -0.61/8 7} 28. Rh5 {(f5h5 e7f8 h5h7 b7b6 d2c3 f8e8 e6f7 e8f8 f7e6
f8e8 h7h5 e8e7 h5h7 e7e8 e6f7 e5f7 c3f6) +3.28/17 7} Nc4 {(e5c4 h5h7 e7e8
d2e1 b7b6 g2g4 f6e5 h3h4) -0.33/7 7} 29. Rh7+ {(h5h7 e7e8 e6f7 e8e7 d2c3
f6e5 c3e5 d6e5 f7e6 e7f8 h7b7 a8b6 b5c7 f8g7 c7e8 g7g6 e8c7) +3.51/17 7}
Ke8 {(e7e8 d2f4 f6e5 f4e5 c4e5 h7b7 c5c4 g2g4) -1.38/7 8} 30. Bf4 {(d2f4
f6e5 f4e5 d6e5 h7b7 e5e4 b7h7 a8b6 b5c7 e8f8 h7h8 f8e7 h8h7 e7f8 h7h8 f8e7
h8d8) +3.69/17 7} Be5 {(f6e5 f4e5 c4e5 g2g4 e5c4 h7b7 a8b6) -1.56/7 7} 31.
Bh6 {(f4h6 e5f6 h7b7 c4e5 h6g7 f6g7 b7g7 a8b6 g7g8 e8e7 g8d8 e7d8 b5d6 d8c7
d6e8 c7b8 e8f6) +4.50/17 7} Bf6 {(e5f6 h7b7 f6e7 g2g4 c4a5 b7a7 a5c4)
-1.67/7 7} 32. Bg4 {(e6g4 d8b8 g4f5 b7b6 h6f4 e8f8 b5d6 f6d4 g1h2 c4e3 f4e3
d4e5 h2g1 e5d6 h7d7 b8e8 e3f2) +4.67/17 7} Rb8 {(d8b8 g4e2 c4a5 b5d6 e8d8
d6f7 d8d7 e2b5 d7c8 g2g4) -2.12/7 7} 33. Bh5+ {(g4h5 e8d8 h7f7 f6e7 h6f8
e7g5 f8d6 g5e3 g1h1 c4d6 b5d6 a8b6 d6b7 b8b7 f7b7 b6d5 h5f7) +4.77/17 8}
Kd8 {(e8d8 h7f7 f6e7 f7g7 d8d7 h6g5 b7b6 g7e7) -3.16/7 7} 34. Bg7 {(h6g7
f6g7 h7g7 a8b6 g7g8 d8e7 g8b8 b6d5 b8b7 e7f8 h5f7 d5e3 b7c7 d6d5 b5c3 c4b6
g2g3) +6.85/17 7} Bxg7 {(f6g7 h7g7 a8c7 g7g8 d8d7 g8b8 c7b5 b8b7 b5c7 g2g4)
-3.31/8 7} 35. Rxg7 {(h7g7 a8b6 g7g8 d8d7 g8b8 b6d5 b8b7 d7c8 h5f3 d5e3
b7e7 d6d5 b5c7 d5d4 c7e6 c4e5 f3e4) +6.73/17 7} Na3 {(c4a3 g7g8 d8e7 g8b8
a3b5 b8e8 e7f6 e8a8 f6e5 h5f3) -4.55/8 8} 36. Rg8+ {(g7g8 d8e7 g8b8 a3b5
b8a8 b5c3 h5f3 b7b5 a8h8 b5b4 h8h7 e7e8 h7c7 b4b3 c7b7 c5c4 g2g3 b3b2 b7b2)
+7.01/19 7} Ke7 {(d8e7 g8b8 a3b5 b8a8 b5c3 a8a7 c3d5 a7b7 e7f6 b7f7 f6e5
g2g4) -4.74/9 7} 37. Rxb8 {(g8b8 a3b5 b8a8 b5c7 a8a7 c7d5 a7b7 e7d8 h5f7
d5e3 b7b8 d8e7 b8b7 e7d8 b7b8 d8e7 b8b7 e7f8 b7c7 d6d5) +6.69/20 7} Nxb5
{(a3b5 b8a8 e7f6 a8b8 f6e5 b8b7 b5c3 g2g4 c3d5) -4.74/9 7} 38. Rxa8 {(b8a8
b5c7 a8a7 c7d5 a7b7 e7d8 h5f7 d5e3 b7b8 d8e7 b8b7 e7d8 b7b8 d8e7 b8b7 e7d8
b7b8 d8e7 b8b7 e7f8 b7c7 d6d5) +6.69/22 7} Nc3 {(b5c3 a8a7 e7f6 a7b7 c3d5
g2g4 c5c4 b7f7 f6e5 h3h4) -4.80/9 7} 39. Bf3 {(h5f3 b7b5 a8h8 e7f7 h8d8
f7e7 d8h8 b5b4 h8h7 e7e8 h7c7 b4b3 c7b7 c5c4 b7b8 e8f7 g2g3 f7g7 b8b6 b3b2
b6b2) +7.00/21 7} b5 {(b7b5 g2g4 b5b4 g4g5 c3b5 a8a5 b5c7 a5a7 e7d7)
-4.87/9 7} 40. Ra7+ {(a8a7 e7e8 a7a8 e8e7 a8a7 e7e8 a7a6 e8e7 a6a7 e7e8
a7h7 b5b4 h7h6 c3b5 f3h5 e8f8 h6g6 c5c4 g2g3 c4c3 h5f3) +7.14/21 7} Kd8
{(e7d8 g2g4 b5b4 g4g5 c3b5 g5g6 b5d4 g1f2 c5c4) -5.06/8 7} 41. Ra6 {(a7a6
d8c7 a6a7 c7c8 a7a6 c8c7 a6a7 c7c8 a7a6 c8c7 a6c6 c7d7 g2g3 d7e7 c6c7 e7e8
c7c8 e8e7 c8h8 b5b4) +7.09/20 7} Kc7 {(d8c7 g2g4 b5b4 a6a7 c7c8 g4g5 b4b3
g5g6 b3b2 f3g4) -4.75/9 7} 42. Rc6+ {(a6c6 c7d7 g2g3 d7e7 c6c7 e7e8 c7c8
e8e7 c8h8 e7f7 h8h7 f7e8 h7h8 e8e7 h8c8 e7f7 c8d8 f7e7 d8c8 c5c4 f3g2)
+7.08/21 7} Kd7 {(c7d7 g2g4 b5b4 g4g5 c3b5 g5g6 b5d4 f3g4 d7e7 g6g7)
-4.91/8 7} 43. Kh1 {(g1h1 d7e7 c6c7 e7e8 c7c8 e8e7 c8c7 e7e8 c7c8 e8e7 c8c7
e7e8 c7c8 e8e7 c8h8 e7f7 h8d8 f7e7 d8h8 b5b4) +7.04/20 8} b4 {(b5b4 g2g4
c3b5 h1g2 b5d4 c6a6 d4b5 h3h4 c5c4) -4.61/9 7} 44. Bg4+ {(f3g4 d7e7 c6c7
e7e8 g4e6 c3e4 e6f7 e8f8 c7d7 f8g7 d7e7 e4g3 h1g1 c5c4 e7d7 c4c3 f7e6 g7h8
d7d8 h8g7 d8d6) +6.86/21 7} Ke7 {(d7e7 g4e6 c3e4 c6a6 b4b3 g2g4 e7f6 h3h4
b3b2 a6b6) -4.05/9 7} 45. Be6 {(g4e6 b4b3 c6c7 e7e8 c7b7 c5c4 e6f7 e8f8
f7e6 f8e8 e6f7 e8f8 f7e6 c3e4 h1g1 e4c3 b7f7 f8e8 f7f2 c3e4 f2f7) +6.90/21
7} Ne4 {(c3e4 c6c7 e7f6 h3h4 f6e5 c7g7 e4f6 g7g5 e5d4 g2g4 c5c4) -4.01/9 7}
46. Rc7+ {(c6c7 e7e8 e6f7 e8f8 c7d7 b4b3 f7g6 e4c3 d7d6 b3b2 d6b6 f8g7 g6f5
c3a4 b6g6 g7h8 d5d6 a4b6 g2g3 c5c4 h1g1) +6.94/21 7} Kf6 {(e7f6 h3h4 f6e5
c7g7 e5d4 g2g4 e4f6 g7g5 c5c4) -4.01/8 7} 47. Rf7+ {(c7f7 f6e5 f7f5 e5d4
f5f3 c5c4 f3f4 d4e3 f4f3 e3e2 f3f4 e4d2 f4f7 d2b3 f7e7 c4c3 e6f7 e2f2 h1h2)
+6.74/19 7} Ke5 {(f6e5 f7f5 e5d4 h1h2 b4b3 g2g4 b3b2 f5f1 e4f6 f1f4)
-3.76/8 7} 48. Rf3 {(f7f3 e5d4 h1g1 c5c4 f3f4 d4e3 f4f3 e3e2 f3f4 e2e3 f4f3
e3e2 f3f4 e2e3 f4f5 c4c3 f5f7 c3c2) +6.57/18 8} Nc3 {(e4c3 f3f5 e5d4 g2g4
b4b3 f5f2 c5c4 f2d2 d4e3 d2b2 e3d4) -3.60/9 7} 49. Rf5+ {(f3f5 e5d4 h1g1
d4c4 g1h2 c4b3 f5f8 c3e4 f8e8 b3a2 e8a8 a2b3 a8e8 e4f2 e6f7 c5c4 e8e7)
+6.64/17 7} Ke4 {(e5e4 g2g4 b4b3 f5f2 e4e5 e6f7 e5e4 f2f6 b3b2) -3.61/8 7}
50. Rg5 {(f5g5 b4b3 g5g4 e4d3 e6f5 d3e2 g4g6 c3d5 g6d6 d5e3 f5g6 c5c4 d6b6
e2f2 b6f6 f2g3) +5.68/16 7} b3 {(b4b3 e6f5 e4d4 g2g4 c5c4 g5g7 c3d5 g7d7
d4e5 h3h4) -2.72/9 7} 51. Rg4+ {(g5g4 e4e3 g4g3 e3d4 g3g4 d4e3 g4g3 e3d4
g3g4 d4e3 g4g3 e3d2 e6f5 b3b2 g3d3 d2c2 d3g3 c2b3 g3g6) +5.12/19 7} Ke5
{(e4e5 h3h4 b3b2 g4g5 e5d4 e6f5 b2b1q f5b1 c3b1 g2g4 b1c3 h1g2 c3d5)
-1.88/9 7} 52. Rg5+ {(g4g5 e5d4 g5g4 d4e3 g4g3 e3d4 g3g4 d4e3 g4g3 e3d2
g3f3 b3b2 e6f5 b2b1q f5b1 c3b1 f3f2 d2c1 f2f1 c1b2) +5.08/20 7} Ke4 {(e5e4)
0.00/10 7} 53. Rg4+ {(g5g4 e4e3 g4g3 e3d4 g3g4 d4e3 g4g3 e3d4 g3g4 d4e3
g4g3 e3d2 e6f5 b3b2 g3d3 d2c2 d3g3 c2b3 g3g6) +5.12/19 7} Ke5 {(e4e5)
0.00/10 8} 54. Rg5+ {(g4g5 e5d4 g5g4 d4e3 g4g3 e3d4 g3g4 d4e3 g4g3 e3d2
g3f3 b3b2 e6f5 b2b1q f5b1 c3b1 f3f2 d2c1 f2f1 c1b2) +5.08/20 7} Ke4 {(e5e4)
0.00/10 7 3-fold repetition} 1/2-1/2
[/pgn]

One quick mod to the basic idea.

Code: Select all

    if (depth > 3) {
      mov->score = -Search(t, m + n, -beta - 10, -alpha + 10, depth - 3);
      if (mov->score > alpha - 10 && mov->score < beta + 10)
      mov->score = -Search(t, m + n, -beta, -alpha, depth - 1);
    }
    else {
      mov->score = -Search(t, m + n, -beta, -alpha, depth - 1);
    }

FEN: rnbqkbnr/pppppppp/8/8/3P4/8/PPP1PPPP/RNBQKBNR b KQkq d3 0 1

Bricabrac:
1 00:00 20 20 +0.66 b1c3
2 00:00 218 218 +0.45 e2e4 d7d5
3 00:00 974 974 +0.67 d2d4 b8c6 e2e4
4 00:00 6k 6k +0.51 g1f3 d7d5 d2d4 e7e6
5 00:00 11k 11k +0.51 g1f3 d7d5 d2d4 g8f6 e2e3
6 00:00 19k 19k +0.43 g1f3 d7d5 d2d4 g8f6 c1e3 e7e6
7 00:00 52k 52k +0.56 g1f3 d7d5 d2d4 g8f6 b1c3 c8e6 e2e3
8 00:00 170k 16,974k +0.50 b1c3 g8f6 e2e4 b8c6 g1f3 d7d5 e4d5 f6d5
9 00:00 580k 14,492k +0.50 e2e4 b8c6 g1f3 g8f6 b1c3 d7d5 e4d5 f6d5 c3d5
10 00:00 978k 12,220k +0.46 e2e4 b8c6 g1f3 e7e5 b1c3 g8f6 f1d3 d7d5 e1g1 c8e6
11 00:00 2,141k 12,595k +0.58 e2e4 e7e5 g1f3 g8f6 b1c3 f8d6 d2d4 b8c6 d4e5 c6e5 c1e3
12 00:00 6,735k 11,816k +0.50 d2d4 g8f6 g1f3 d7d5 b1c3 b8c6 c1f4 c8e6 a1c1 h7h6 e2e3 a7a6
13 00:02 26,556k 12,126k +0.47 d2d4 g8f6 g1f3 d7d5 b1c3 e7e6 e2e3 f8d6 f1d3 e8g8 e1g1 b8c6 e3e4
14 00:05 61,342k 11,981k +0.53 d2d4 g8f6 g1f3 d7d5 b1c3 b8c6 f3e5 c8e6 e5c6 b7c6 c1g5 h7h6 g5f6 e7f6
15 00:14 168,189k 11,996k +0.50 d2d4 g8f6 g1f3 d7d5 b1c3 b8c6 c1f4 c8e6 e2e3 a8c8 f1d3 c6b4 e1g1 b4d3 d1d3
16 00:33 402,191k 11,878k +0.50 d2d4 g8f6 g1f3 d7d5 c1f4 b8c6 e2e3 e7e6 f1b5 f8d6 e1g1 e8g8 f4d6 d8d6 b1c3 c8d7

A lot more like Bric's 'normal' pv lines.

Game vs TSCP. I did not cherry pick these games. The game above was the very first game. This game is the 3rd because the second was a quick draw.

[pgn][Event "Stafford.at"]
[Site "DESKTOP-HFVHK2B"]
[Date "2021.03.02"]
[Round "2"]
[White "Tscp181"]
[Black "Bricabrac"]
[Result "1/2-1/2"]
[BlackElo "2200"]
[ECO "A70"]
[Opening "Benoni"]
[Time "17:17:42"]
[Variation "Classical, 7...Bg7"]
[WhiteElo "2200"]
[TimeControl "0+8"]
[Termination "normal"]
[PlyCount "49"]
[WhiteType "human"]
[BlackType "human"]

1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8.
Bb5+ {(f1b5 c8d7 b5d3 f6g4 e1g1 g7c3 b2c3) +0.77/6 7} Nbd7 {(b8d7 e1g1 e8g8
c1e3 h7h6 a1c1 a7a6 b5e2 f8e8 e2d3 c5c4 d3c4 f6e4 c3e4) -0.48/14 8} 9. Bf4
{(e1g1 e8g8 c1g5 d7b6 g5f6 g7f6) +0.80/6 7} a6 {(a7a6 b5a4 d8c7 e1g1 e8g8
a1c1 d7e5 h2h3 h7h6 f1e1 f8d8 a4b3 c5c4 f3e5) -0.40/14 8} 10. Bxd7+ {(b5d7
f6d7 d1b3 d7b6 e1g1 c8g4 f4g5) +0.99/6 7} Qxd7 {(d8d7 e1g1 e8g8 a1c1 d7c7
h2h3 f8e8 f1e1 c8d7 e4e5 d6e5 f3e5) -0.22/12 7} 11. e5 {(e4e5 f6h5 f4e3
d6e5 e3c5 h5f4) +1.15/6 7} Nh5 {(f6h5 e5e6 f7e6 d5e6 d7e6 f4e3 e8g8 e1g1
g7c3 f3g5 e6c4 b2c3 h7h6 g5f3 c4c3 e3h6) +0.24/16 7} 12. Be3 {(f4e3 d6e5
e3c5 h5f4 e1g1 e5e4 c3e4 f4d5) +1.05/7 7} dxe5 {(d6e5 e3c5 h5f4 e1g1 d7g4
g2g3 c8f5 c5d6 f4d3 f3h4 e8c8 h4f5 g4f5 d6e7) +0.38/14 7} 13. Bxc5 {(e3c5
h5f4 e1g1 e5e4 c3e4 f4d5) +1.05/6 7} Nf4 {(h5f4 e1g1 d7g4 g2g3 c8f5 f3h4
g4d1 a1d1 f4h3 g1h1 f5g4 f2f3 g4h5) +0.49/13 7} 14. g3 {(g2g3 f4g2 e1f1
d7c7 f1g2 c7c5 g2g1) +1.25/6 7} Ng2+ {(f4g2 e1f1 d7h3 f1g1 c8g4 c3e4 g2e1
e4d6 e8e7 d1e1 g4f3 e1f1 h3f1 a1f1 f3h1 g1h1) +0.55/16 7} 15. Kf1 {(e1f1
d7h3 f1g1 c8g4 d5d6 e8g8 a1c1 g4f3 d1f3) +1.20/6 7} Qh3 {(d7h3 f1g1 c8g4
f3g5 g4d1 g5h3 d1f3 h3g5 g2h4 g3h4 f3h1 g1h1 h7h6 g5e4 e8c8) -0.25/15 7}
16. Kg1 {(f1g1 c8g4 c3e4 g4f3 e4d6 e8e7 d1f3) +1.21/6 7} Bg4 {(c8g4 f3g5
h3h5 d1d2 h7h6 g5e4 h5h3 e4d6 e8f8 a1f1 g4f3 d6b7 f8g8 b7d6) -0.21/14 7}
17. Qa4+ {(d1a4 g4d7 a4b3 b7b5 f3g5 h3f5 g5f7 f5f7 g1g2) +1.60/7 8} Bd7
{(g4d7 f3g5 h3h5 a4c2 h5g5 c3e4 g2e3 c2c1 g5h5 c1e3 h7h6 e4d6 e8f8 e3b3
h5h3) -0.51/15 7} 18. Qb3 {(a4b4 b7b5 f3g5 h3f5 g5f7 f5f7 g1g2) +1.60/6 7}
Nf4 {(g2f4 f3h4 a8c8 b3b6 h3g4 c5e3 f4h3 g1g2 h3f4 e3f4 g4h3 g2g1 e5f4
b6b7) +1.10/14 7} 19. Nh4 {(f3h4 b7b5 c5d6 f7f6 a1e1 h3g4) +0.88/6 7} Rc8
{(a8c8 b3b6 h3g4 b6d6 g4g5 a1e1 f4h3 g1f1 d7g4 c3e4 g5d8 c5b6 d8d7)
+0.86/13 7} 20. Qb6 {(b3b6 h3g4 c5e3 f4h3 g1g2 g6g5 h4f3) +0.52/6 7} Qg4
{(h3g4 c5e3 e8g8 b6b7 c8b8 b7a6 b8b2 e3f4 e5f4 h2h3 g4h5 a6d6) +1.13/12 7}
21. Qd6 {(b6d6 g4g5 h4f3 f4h3 g1f1 g5f6 f1e2) +0.63/6 7} Nh3+ {(f4h3 g1g2
h3f4 g2g1 f4h3 g1g2 h3f4 g2g1 f4h3 g1g2 h3f4 g2g1) +1.18/12 7} 22. Kg2
{(g1g2 h3f4 g2g1) 0.00/6 7} Nf4+ {(h3f4 g2g1 f4h3 g1g2 h3f4 g2f1 f4d5 c3d5
g4c4 f1g1 c4c5 d5f6) +1.13/12 7} 23. Kg1 {(g2g1) 0.00/7 8} Nh3+ {(f4h3 g1g2
h3f4 g2g1 f4h3 g1g2 h3f4 g2g1 f4h3 g1g2 h3f4 g2g1) +1.18/12 7} 24. Kg2
{(g1g2) 0.00/8 7} Nf4+ {(h3f4 g2g1 f4h3 g1g2 h3f4 g2f1 f4d5 c3d5 g4c4 f1g1
c4c5 d5f6) +1.13/12 8} 25. Kg1 {(g2g1) 0.00/7 7 3-fold repetition} 1/2-1/2
[/pgn]

There is something here but how do we get the most out of this idea?

[Ras]

One quick mod to the basic idea.

I'm sceptical on both. Sure you can also reduce even the first move, but all it does is arbitrarily inflating the main search depth that you give to the GUI. And second, why would you want to open the window? Not only that this defeats recursive null window search, but a wider window neither can compensate for less search depth.

[Mike Sherwin]

One quick mod to the basic idea.

I'm sceptical on both. Sure you can also reduce even the first move, but all it does is arbitrarily inflating the main search depth that you give to the GUI. And second, why would you want to open the window? Not only that this defeats recursive null window search, but a wider window neither can compensate for less search depth.

Not arbitrarily. The interest is in those moves that fall within the AB window. And the AB window is very wide at first so it is not inflated because of the first move anyway. If anything searching depth - 3 with a too wide window is a waste of time. And searching depth - 3 with an open window does not throw out as many lines. It keeps the closest lines to the window to investigate further. The same rules that apply to nominal depth do not apply to reduced depth.

Edit: And besides this is the idea in its simplest form. A starting point only. The first move can be excluded if that would be an improvement.

How come no one ever understands me?

Edit 2: And if the window is opened further it is possible to reduce even more.

[Mike Sherwin]

After my last post I continued the tournament and this is the 4th game of the tournament. The 5th game in total so far. And it is with the open window.
[pgn][Event "Stafford.at"]
[Site "DESKTOP-HFVHK2B"]
[Date "2021.03.02"]
[Round "4"]
[White "Tscp181"]
[Black "Bricabrac"]
[Result "0-1"]
[BlackElo "2200"]
[ECO "A90"]
[Opening "Dutch"]
[Time "18:06:18"]
[Variation "Dutch-Indian, 5.Bd2"]
[WhiteElo "2200"]
[TimeControl "0+8"]
[Termination "normal"]
[PlyCount "100"]
[WhiteType "program"]
[BlackType "program"]

1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Bb4+ {(f8b4 c1d2 c7c5 g1f3 e8g8 e1g1
b8c6 e2e3 f6e4 b1c3 e4d2 d1d2 c5d4 e3d4) -0.51/14 7} 5. Bd2 {(c1d2 b4e7
b1c3 b8c6 g2c6 d7c6 g1f3 e8g8) -0.15/7 7} c5 {(c7c5 d4d5 e8g8 b1c3 f8e8
g1f3 e6d5 c4d5 f6e4 e1g1 e4d2 f3d2 b4c3 b2c3) -0.57/14 7} 6. Bxb4 {(d2b4
c5b4 g1f3 b8c6 b1d2 d7d5 e1g1) +0.18/7 7} cxb4 {(c5b4 g1f3 e8g8 e1g1 d8c7
b1d2 d7d5 a1c1 b8c6 c4d5 e6d5 e2e3 h7h6 f3e5 a7a6) -0.55/15 7} 7. d5 {(d4d5
e6d5 c4d5 e8g8 g1f3 d7d6 e1g1) +0.14/7 7} Qc7 {(d8c7 b1d2 e8g8 a1c1 d7d6
g1f3 c7e7 f3d4 e6e5 d4b5 a7a6 d1a4 b8d7 e1g1) -0.35/14 7} 8. Nd2 {(b1d2
b8a6 e2e3 a6c5 d2b3 d7d6 g1f3) +0.27/7 8} O-O {(e8g8 a1c1 e6e5 g1f3 d7d6
e1g1 b8d7 a2a3 a7a5 f3g5 d7c5 d2f3 h7h6) -0.53/13 7} 9. e3 {(e2e3 b8a6 g1e2
d7d6 e1g1 c8d7 e2d4) +0.27/7 8} Re8 {(f8e8 g1e2 d7d6 e1g1 b8d7 a1c1 d7c5
d2f3 e6e5 a2a3 e5e4 f3g5) -0.56/12 7} 10. Ne2 {(g1e2 d7d6 e1g1 b8d7 e2d4
d7e5 a1c1) +0.27/7 7} Na6 {(b8a6 e1g1 d7d6 e2f4 e6e5 f4h5 f6h5 d1h5 c8d7
a1d1 a6c5 e3e4 f5e4) -0.66/13 7} 11. O-O {(e1g1 d7d6 e2d4 c8d7 d1b1 e6d5
g2d5) +0.25/7 7} d6 {(d7d6 e2d4 a6c5 a2a3 b4a3 a1a3 e6e5 d4b5 c7d8 b2b4
c5e4 a3d3 h7h6) -0.72/13 8} 12. Qb1 {(d1b1 e6d5 c4d5 a6c5 e2d4 f6e4 d2c4)
+0.26/7 7} e5 {(e6e5 a2a3 c8d7 f1e1 h7h6 a3b4 a6b4 h2h3 a7a6 e3e4 b7b5 e4f5
b5c4) -0.30/13 7} 13. e4 {(e3e4 f5e4 g2e4 c8d7 f1c1 a6c5 c1e1) +0.23/7 7}
g6 {(g7g6 b1c2 a6c5 f2f3 c8d7 a1d1 a8d8 h2h3 h7h6 a2a3 a7a5 a3b4 a5b4 f1e1)
-0.06/14 7} 14. a3 {(a2a3 c8d7 b2b3 b4a3 a1a3 a6c5 b3b4) +0.35/7 7} Nxe4
{(f6e4 g2e4 f5e4 d2e4 e8f8 a3b4 c8h3 f1e1 a6b4 e2c3 h3g4 a1a4 c7b6 b2b3)
-0.13/14 7} 15. Bxe4 {(g2e4 f5e4 d2e4 e8f8 b2b3 b4a3 f1e1 c8f5 a1a3 f5e4
b1e4) +0.38/8 7} fxe4 {(f5e4 d2e4 e8f8 b1c2 c8g4 a1c1 a8d8 f1e1 g4f3 e4g5
b4a3 g5e6 a3b2 e6c7) +0.12/14 7} 16. Nxe4 {(d2e4 e8f8 b2b3 c8f5 f2f3 c7b6
f1f2 a6c5) +0.28/7 7} Rf8 {(e8f8 a3b4 c7c4 e2c3 c4b4 b1c2 b4b6 c2e2 a6c5
e4c5 b6c5 a1d1 c8d7 h2h4) +0.05/14 7} 17. b3 {(b2b3 c8f5 a3b4 f5e4 b1e4
a6b4 f1e1) +0.28/7 7} Bg4 {(c8g4 f1e1 h7h6 b1c2 g4f5 a3b4 a6b4 c2b1 a7a6
e2c3 b7b6 b1d1 a8d8) +0.08/13 7} 18. Re1 {(f1e1 b4a3 a1a3 g4f5 e2c3 a6c5
c3b5) +0.28/7 7} h6 {(h7h6 b1c2 g4f5 a3b4 a6b4 c2b1 a7a5 e2c3 a8d8 b1d1
f8f7 c3b5) +0.09/12 7} 19. axb4 {(a3b4 a6b4 e2c3 c7b6 c3a4 b6a6 a4c3)
+0.42/7 8} Nxb4 {(a6b4 e2c3 a7a6 a1a4 c7b6 c3b5 a6b5 a4b4 g4d7 b1d3 d7f5
e1f1 f5e4 d3e4) -0.11/14 7} 20. N2c3 {(e2c3 c7b6 e1e3 g4f5 b1d1 f5e4 c3e4)
+0.36/7 7} a6 {(a7a6 a1a4 c7b6 c3b5 a6b5 a4b4 g4d7 b1d3 b6a5 d3d2 f8f3 e4d6
f3b3) -0.42/13 7} 21. Qc1 {(b1c1 g6g5 c1d2 g4f3 a1a4 f3e4 c3e4) +0.55/6 7}
Kg7 {(g8g7 c1d2 g4f3 a1c1 a8d8 d2e3 f3g4 c4c5 d6c5 e3c5 c7c5 e4c5 b4d5)
-0.08/13 7} 22. Qd2 {(c1d2 g4f3 a1a4 c7b6 h2h3 a8c8) +0.82/6 7} Bf3 {(g4f3
a1c1 a8d8 d2e3 c7f7 h2h3 f7d7 g1h2 f8f7 e4d2 f3h5 c4c5) +0.04/12 7} 23. Ra4
{(a1a4 c7b6 h2h3 a8c8 e1a1 f3e4 c3e4) +0.76/7 7} Qb6 {(c7b6 c3b5 f3e4 a4b4
a6a5 b4a4 e4f3 a4a1 f8e8 h2h3 e8d8 h3h4 e5e4 a1c1) +0.01/14 7} 24. Nxd6
{(e4d6 b6d6 c3e4 f3e4 a4b4 e4d5 c4d5) +1.01/7 7} Qxd6 {(b6d6 c3e4 f3e4 a4b4
e4f3 b4b7 f8f7 b7f7 g7f7 d2h6 f7g8 c4c5 d6f6 d5d6 a8d8) -0.18/15 7} 25. Ne4
{(c3e4 f3e4 a4b4 e4f5 b4b7 f5d7 c4c5 d6e7) +1.56/7 7} Bxe4 {(f3e4 a4b4 e4f3
b4b7 f8f7 b7f7 g7f7 d2h6 f7g8 c4c5 d6f6 d5d6 a8d8 h2h3 e5e4) -0.22/15 7}
26. Rxb4 {(a4b4 e4f3 b4b7 f8f7 b7f7 g7f7 d2h6 f3d5 c4d5 d6d5) +1.60/7 7}
Bf3 {(e4f3 b4b7 f8f7 b7f7 g7f7 d2h6 f7g8 c4c5 d6f6 d5d6 a8d8 h2h3 a6a5
h3h4) -0.16/14 8} 27. Rxb7+ {(b4b7 f8f7 b7f7 g7f7 d2e3 e5e4 e3h6 f7e8 h2h3)
+1.96/7 7} Rf7 {(f8f7 b7f7 g7f7 d2h6 a8d8 h6h7 f7f6 h2h3 e5e4 e1e3 d6e7
h7h4 g6g5 h4h6 f6f7 h6h7 f7e8) -0.23/17 8} 28. Rxf7+ {(b7f7 g7f7 d2h6 f7g8
e1e3 a8f8 h6g5 e5e4 h2h3) +1.89/8 7} Kxf7 {(g7f7 d2h6 a8d8 h6h7 f7f6 h2h3
e5e4 e1e3 d6e7 h7h4 g6g5 h4h6 f6f7 h6h7 f7e8) -0.23/15 7} 29. Qxh6 {(d2h6
f7g8 e1e3 e5e4 h2h3 a8b8 h6g5) +1.89/7 7} Qf6 {(d6f6 h6h7 f7f8 h2h3 a8d8
h3h4 f8e8 h7h6 d8d7 b3b4 d7d8 e1f1 f6f7 f1e1) +0.01/14 7} 30. Qh7+ {(h6h7
f7f8 h7c7 e5e4 d5d6 f8g8 d6d7 a8f8) +2.33/7 7} Kf8 {(f7f8 h7c7 e5e4 d5d6
f6c3 c7e7 f8g8 e7e6 g8g7 e1f1 c3b3 d6d7 a8d8 e6e8) +0.04/14 7} 31. Qc7
{(h7c7 e5e4 d5d6 f6c3 e1b1 f8e8 d6d7) +2.30/7 7} e4 {(e5e4 d5d6 f6c3 c7e7
f8g8 e7e6 g8g7 e1f1 c3b3 d6d7 b3b8 h2h3 a6a5 c4c5 b8c7) +0.04/15 7} 32. d6
{(d5d6 f6c3 c7e7 f8g8 e7e6 g8h8 e6h3 h8g8 e1e3 c3a1) +2.19/7 7} Qe5 {(f6e5
c7h7 a8d8 c4c5 e5g7 h7h3 f8g8 h3e6 g8h8 e1f1 f3e2 f1e1 e2f3 c5c6 g7c3)
-0.09/15 7} 33. Qb7 {(c7b7 a8d8 c4c5 f8e8 b7c6 d8d7 c6c8 d7d8 d6d7) +2.53/7
7} Rd8 {(a8d8 c4c5 f8g8 b7b4 g8h7 b4b6 d8d7 b6c6 e5f5 c6c8 h7g7 b3b4 d7f7
c8f5 f7f5) +0.02/15 7} 34. c5 {(c4c5 f8g8 b7c7 d8f8 c5c6 f8f7 c7d8) +2.55/7
7} Kg8 {(f8g8 b7b6 d8d7 b6c6 d7d8 c6b6 e5g5 b3b4 g5f6 b6a6 f6c3 a6a2 g8h8
a2b1 d8e8) -0.19/15 7} 35. Qb6 {(b7b6 d8d7 b6b8 g8f7 b8c8 e5e6 c8b8 a6a5)
+2.58/7 7} Rd7 {(d8d7 b6c6 d7d8 h2h3 e5e6 c6b6 e6d7 b3b4 d8c8 g1h2 c8c6
b6b8 c6c8 b8b6 c8a8 b6c7) +0.18/16 7} 36. Qc6 {(b6c6 d7d8 c6c7 d8f8 c5c6
e5c3 e1e3) +2.55/7 7} Rd8 {(d7d8 c6b6 d8d7 b6c6 d7d8 c6b6 e5g5 b3b4 g5f6
b6a6 f6c3 a6a2 g8h8 a2b1 d8e8) -0.19/15 7} 37. h3 {(h2h3 e5c3 c6d5 g8h8
e1f1 c3d3 d5g5 d8c8) +2.35/7 7} Qe6 {(e5e6 c6b6 e6d7 g1h2 d8c8 b3b4 c8c6
b6a5 g8h7 a5a2 d7f5 a2a1 f5f7 a1a4 f7d7) +0.09/15 7} 38. Qb6 {(c6b6 d8c8
g3g4 e6d7 b3b4 c8c6 b6b8) +2.27/7 7} Qd7 {(e6d7 g1h2 d7c8 h2g1 d8d7 b3b4
c8b7 b6b7 d7b7 c5c6 b7b4 d6d7 b4d4 c6c7) +0.19/14 7} 39. b4 {(b3b4 d8a8
g3g4 d7d8 b6c6 d8c8 c6b6) +2.37/7 7} Kg7 {(g8g7 e1e3 d8e8 b6c7 d7c7 d6c7
e8c8 e3a3 c8c7 a3a6 c7b7 a6b6) +0.71/12 7} 40. g4 {(b6c7 d7c7 d6c7 d8c8
e1a1 c8c7 a1a6) +1.56/7 7} Rh8 {(d8h8 g1h2 d7f7 b6c7 f7c7 d6c7 h8c8 e1a1
c8c7 a1a6 c7f7 a6d6 f7b7 d6b6 b7b6) +1.10/15 7} 41. Qc7 {(b6c7 d7c7 e1e4
c7b8 e4e3 h8h3 e3e7) -6.85/7 7} Qxc7 {(d7c7 g1h2 c7f7 e1g1 f7e6 g1g3 f3g4
h2g1 h8h3 g3h3 g4h3 g1h2 e4e3 h2g1 e3f2) +11.20/15 7} 42. Kh2 {(g1h2 c7c8
e1g1 a6a5 g1b1 a5b4 b1b4 c8c5) -9.48/8 7} Qb7 {(c7b7 e1b1 f3g4 b1b3 g4f3
b3b2 b7f7 h2g3 f7d7 h3h4 d7d8 g3h2 h8h4 h2g1 h4h1) +12.05/15 7} 43. Rb1
{(e1b1 b7d5 b1g1 d5e5 g1g3 e5b2 h2g1 b2b4 d6d7 b4c5) -10.27/8 7} Bxg4
{(f3g4 b1b3 g4f3 b3b2 g7g8 b2c2 b7b4 h2g3 b4e1 d6d7 g8g7 c5c6 e1g1 g3f4
h8d8) +12.10/15 7} 44. c6 {(b4b5 h8h3 h2g2 b7c8 g2g1 c8c5 b5a6 c5d6)
-11.47/7 7} Qxc6 {(b7c6 h2g2 h8h3 b1f1 c6d6 f1h1 h3f3 h1a1 d6b6 a1a2 e4e3
f2e3 f3e3 a2f2 b6b4) +14.88/15 7} 45. Rb3 {(b1b3 c6d6 b3g3 h8h3 h2g2 h3g3
f2g3 e4e3 g2f1 d6b4) -15.17/7 7} Qxd6+ {(c6d6 h2g1 h8h3 b3h3 g4h3 g1h1 d6b4
h1h2 b4c3 h2g1 c3e1 g1h2 h3e6 h2g2 e6b3) +15.32/15 7} 46. Kg1 {(h2g2 g4f3
b3f3 e4f3 g2f3 d6d3 f3g4 d3h3 g4f4 h8f8 f4e4 f8f2) -16.05/6 7} Qd1+ {(d6d1
g1g2 d1b3 h3h4 b3b4 g2g1 b4e1 g1g2 h8h4 g2g3 e1h1 g3f4 g4f3 f4g5 h4h2)
+20.98/15 7} 47. Kg2 {(g1g2 d1b3 h3h4 b3b4 g2f1 b4b1 f1g2 h8h4) -20.00/6 8}
Qxb3 {(d1b3 h3h4 b3b4 g2g3 g4f3 g3h2 b4e1 h2g3 h8d8 g3h3 e1f2 h4h5 g6g5
h5h6 g7h6) +21.61/15 7} 48. Kg1 {(g2g1 b3h3 f2f3 h3f3 b4b5 h8h1) -M3/7 3}
Qxh3 {(b3h3 f2f4 e4e3 b4b5 h3h1 f2e1 h3h2 e1f1 f3f2) +M3/13 7} 49. f3
{(f2f3 h3f3 b4b5 h8h1) -M2/5 0} Qxf3 {(h3f3 b4b5 h8h1) +M2/13 7} 50. b5
{(b4b5 h8h1) -M1/3 0} Rh1# {(h8h1 b5a6) +M1/11 7} 0-1
[/pgn]

[Mike Sherwin]

A dozen games into the match and the score is Bric +4 -1 =7. Yes, I know 12 games is not statistically enough. However, at this stage of the match before this reduction with an open window Bric +1 -4 =7 would be more like it. I really have to stop being distracted and add 3-fold repetition detection because 4 of the 7 draws using SF13 and my own judgement can be changed to wins for Bric. But, to be conservative I'm only changing 3 of them to wins. So Bric +7 -1 =4 is +191. That is a performance of ccrl 1692 for TSCP + 191 = 1883! Already 400 elo above Carnivor which is also about at this stage of development. I'll let this match go the full 100 games. It will be a pain adjusting the score for all those draws.

[Mike Sherwin]

Just a bedtime update. Twenty five of 100 games is finished. The score is Bric +8 -5 =12, +42. If Bric wins the match without adjusting the draw scores that would be a fantastic result. If Bric wins the match by only adjusting the draw scores then it would depend by how much whether this is an improved performance. So far this is a greatly improved performance. With the draws adjusted the score is Bric +13 -5 =7, +115, 1692 + 115 = 1807.

[Mike Sherwin]

A bug has shown up in the engine that caused Bric to lose a few games and at the halfway point the match was tied. When Bric's king is forced to a1 on the next move it commits suicide by capturing itself. So I ended the match.