Hoffman vs Petrov, 1844

[pedrox]

[d]r1bqk2r/pppp1Npp/8/2bnP3/8/6K1/PB4PP/RN1Q3R b - - 0 12

Some engine sees 12 ... O-O!!?

[Dann Corbit]

[d]r1bqk2r/pppp1Npp/8/2bnP3/8/6K1/PB4PP/RN1Q3R b - - 0 12

Some engine sees 12 ... O-O!!?

All the engines I tried so far choose Qe7 with an eval of about +2.5 pawns. Most in well under one second.

Arasan:
14 01:06 113.323.861 1.708.228 +2.50 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Rf1xf7 Qe7g5+ Kg3f3 Qg5h5+ g2g4 Qh5xf7+ Qd5xf7+ Ke8xf7 Nb1c3 b7b6 Nc3b5 c7c6 Nb5d4

Baron:
13 01:17 31.813.115 413.157 +2.15 Qd8-e7 Qd1xd5 Rh8-f8 Rh1-f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1-c3 b7-b6 Nc3-b5 Bc8-b7 Ra1-f1+

ChessTiger:
20 01:25 132.302.937 1.581.058 +2.18 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 b7b6 Nc3b5 c7c6 Nb5d6+ Bc5xd6 e5xd6 Bc8b7 Kg3f2 Ra8e8

Deep Frenzie:
18/45 01:26 351.224.298 4.085.429 +2.23 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 Bc5d4 Ra1f1+ Kf7g6 Nc3d1 Bd4xb2 Nd1xb2 Ra8b8 Nb2d3 b7b6 Nd3f4+ Kg6f5 Nf4d5+ Kf5xe5 Nd5xc7 Bc8b7 Rf1e1+ Bb7e4

Shredder:
16/47 01:02 182.154.161 2.912.555 +2.22 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 Bc5d4 Nc3a4 Bd4xb2 Na4xb2 d7d6 Ra1c1

Fruit:
18 01:13 104.048.078 1.417.633 +1.85 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 Bc5d4 Ra1f1+ Kf7g6 Nc3a4 Bd4xb2 Na4xb2 b7b6 Rf1c1 c7c5 Rc1d1 Kg6f5 Nb2c4 Bc8a6 Rd1f1+ Kf5e4 Rf1f4+ Ke4d5

Gandalf:
13/47 01:07 57.690.735 854.677 +2.30 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 Bc5d4 Ra1f1+ Kf7g6 Nc3d1 Bd4xb2 Nd1xb2 b7b5 Rf1c1 c7c6

Glaurung:
20 01:43 520.252.040 5.010.372 +3.11 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 Bc5d4 Kg3f4 d7d6 e5xd6 c7xd6 Nc3a4 Bd4xb2 Na4xb2 Bc8e6 Kf4e4 Ra8e8 Ke4d4 Kf7e7 Nb2d3 Re8f8

Hiarcs:
16/41 01:50 193.526.334 1.765.638 +2.27 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 Bc5d4 Ra1f1+ Kf7g6 Nc3d1 Bd4xb2 Nd1xb2 b7b6 Rf1c1 c7c5 Nb2c4 Bc8a6 Nc4d6

Ktulu:
16 01:05 133.525.512 2.029.880 +1.88 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 b7b6 Ra1d1 Ra8b8 Nc3b5 Rb8b7 Rd1f1+ Kf7e6 Bb2c3 a7a6 Nb5d4+ Ke6d5 Nd4f5

List:
17 01:10 587.826.408 8.332.880 +2.21 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1c3 b7b6 Ra1f1+ Kf7g6 Nc3d5 Bc8a6 Rf1d1

Thinker:
Best move (MP-(Passive)Thinker_64-bit): Qd8-e7

Naum:
19/40 01:37 212.173.052 2.172.301 +1.73 Qd8e7 Qd1xd5 Rh8f8 Bb2d4 Bc5xd4 Qd5xd4 Rf8xf7 h2h4 Rf7f5 Rh1e1 d7d6 Nb1c3 d6xe5 Qd4d5 Ke8f8 Ra1d1 c7c5 Nc3e4 c5c4

Rybka 3:
16 00:59 12.737.960 221.255 +1.93 Qd8e7 Qd1xd5 Rh8f8 Nb1d2 Rf8xf7 Nd2f3 d7d6 h2h3 c7c6 Qd5d2 Bc8e6 Kg3h2 d6xe5 Bb2xe5 Ra8d8

Zappa:
16/52 01:47 298.889.493 2.807.239 +1.34 Qd8e7 Qd1xd5 Rh8f8 Rh1f1 Rf8xf7 Qd5xf7+ Qe7xf7 Rf1xf7 Ke8xf7 Nb1d2 d7d5 Ra1c1 Bc5b6 Nd2b3 Bc8f5 Rc1f1 Kf7g6 Nb3d4 Ra8f8 e5e6 Bb6c5 Nd4xf5 Rf8xf5

Out of curiosity, what program wants to castle?

[Dirt]

[d]r1bqk2r/pppp1Npp/8/2bnP3/8/6K1/PB4PP/RN1Q3R b - - 0 12

Some engine sees 12 ... O-O!!?

Are you sure this wasn't the position?
[d]r1bqk2r/pppp1Npp/8/2bnP3/8/6K1/PB4PP/RN1Q3R b kq - 0 12
Castling looks good here.

[pedrox]

[d]r1bqk2r/pppp1Npp/8/2bnP3/8/6K1/PB4PP/RN1Q3R b - - 0 12

Some engine sees 12 ... O-O!!?

Are you sure this wasn't the position?
[d]r1bqk2r/pppp1Npp/8/2bnP3/8/6K1/PB4PP/RN1Q3R b kq - 0 12
Castling looks good here.

You're right, I forget castling rights

[pedrox]

Dann, if your forces move 12 ... O-O, then you'll see that the eval rises rapidly approximately +7 and if white eat the queen there is a mate for the black in 13.

[Dann Corbit]

Dann, if your forces move 12 ... O-O, then you'll see that the eval rises rapidly approximately +7 and if white eat the queen there is a mate for the black in 13.

With castling rights restored to the record, most programs want to castle in under one minute.