Andreas Moser (1768) - Spanton (1954)
King's Pawn Irregular
1.e4 e5 2.d3!?
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2...Bc5 3.Nf3 Nc6
Stockfish17 and Dragon1 do not like this, much preferring 3...d6!?
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4.Be2
The engines reckon 4.Nxe5!? leaves White at least slightly better, eg 4...Nxe5 5.d4 Bd6 6.dxe5 Bxe5 7.f4, or 4...Bxf2+!? 5.Kxf2 Nxe5 6.d4, with White in both cases gaining a central space advantage.
4...Nf6 5.c3 0-0 6.0-0
After 6.b4 Bb6!? 7.b5 Ne7 8.Nxe5 d5 Black has full compensation for a pawn, according to the engines.
6...d5 7.exd5!?
The engines prefer this over the more popular 7.Nbd2.
7...Qxd5!? 8.Qc2!?
Apparently a novelty, which is not easy in this position! Known moves are 8.b4, 8.Be3, 8.Nbd2, 8.a4, 8.h3 and 8.Bg5.
8...Bf5!? 9.c4?
This not only makes d3 backward, but is flawed tactically.
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9...Qd7
This is good enough for an advantage, but even stronger seem to be 9...Nb4!?, 9...Qd6 and possibly 9...Qe6.
10.a3?
White does not have time for this. The engines give 10.Nc3, meeting 10...Nb4 with 11.Qb3, when the unprotected state of e5 gives White counterplay. However the engines reckon 10...Rae8!? leaves Black with the upper hand.
10...a5?!
Almost certainly stronger is 10...e4 11.dxe4 Nxe4!?
11.Nc3 Rfe8 12.Ne4 Be7
The engines like 12...Nxe4!? 13.dxe4 Bg4.
13.Nxf6+?!
This is not an equal exchange as the white knight is better than Black's, and the exchange makes Black's dark-square bishop more active.
13...Bxf6 14.Rd1 Rad8 15.Be3 Nd4 16.Nxd4 exd4 17.Bf4 Be5
The engines suggest 17...g5!?, one point being 18.Bd2?? is a blunder thanks to 18...Rxe2.
18.Bg3!?
Dragon1 marginally prefers this over 18.Bxe5, but Stockfish17 fluctuates between the two moves.
18...Bxg3 19.hxg3 Re6
The engines reckon 19...Re5!? keeps a slight edge.
20.Bf3
AM offered a draw.
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Black has more space in the centre, the better development and the more flexible kingside pawns, but White is well-placed for play on the queenside. The engines reckon the position is completely equal.
20...Rde8!?
20...c5 21.b4!? probably favours White.
21.Kf1!?
Not 21.Bxb7?? c6 (21...Re2 is also very strong).
21...Rh6
The engines prefer 21...g5!? (Stockfish17) or 21...b6 (Dragon1).
22.Kg1 Bg4
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23.Re1??
White is fine after 23.Bxg4 Qxg4 and 24.Re1 or 24.Qa4.
White is fine after 23.Bxg4 Qxg4 and 24.Re1 or 24.Qa4.
23...Bxf3 24.Rxe8+
This is best, according to the engines, but a better practical try is 24.gxf3!? as then Black has only one winning move.
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After 24.gxf3!? the engines reckon Black has to find 24...Rf8!, when there is no defence to the threat of 25...Qh3 etc, eg 25.g4 Qd6, when there is no defence to the threat of 26...Qh2+ etc.
24...Qxe8 25.gxf3 f5!?
This is best, but 25...Qe6 also wins easily.
26.g4
Otherwise 26...Qh5 is fatal.
26...fxg4 27.fxg4 Qc6 28.f3 Qxf3 29.Qg2 Qe3+ 0-1
If 30.Qf2, then 30...Rh1+! wins.
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