Horwitz Defense with an early g5: how the g-pawn beat my opening (game 1768)

The Horwitz Defense with an early g5 cost me a bishop in six moves. In game 1768, after 1.d4 e6 2.Bf4 g5, Black's g-pawn went to g4 and attacked my knight on f3. I answered with a bishop move to e5 instead of saving the knight. Stockfish's evaluation dropped from +0.34 to -3.99, and one move later I traded the bishop for a single pawn.

The recorded game

I played this ten-minute rapid game (no increment) on October 31, 2025 as White against Olsmokey1 (1254). My recorded rating for the game was 1253. This page is only about the first twelve moves. What happened after that, a winning position and a mate on my first rank, is in the collapse story of the same game.

The Horwitz Defense is what Chess.com calls 1.d4 e6. I met it often that autumn with my London-style 2.Bf4. In games 1705, 1707, 1708 and 1719 I won with it, and my opening accuracy there was between 82.0% and 94.7%. In none of those four did Black push the g-pawn early. In game 1760, two days before this one, kalkiAD2829 (1273) did: 1.d4 e6 2.Bf4 Nc6 3.Nf3 h6 4.e3 g5. My bishop went to g3 and, on move 7, to e5, which the analysis marks as a blunder. Game 1768 repeated the idea a lot faster.

The g-pawn's three steps

Black's plan was easy to read afterwards. 2...g5 attacked my bishop on f4. I moved it to g3, the engine's choice. 3...Bg7 put a bishop on the long diagonal. Then 4.Nf3, which the analysis calls an inaccuracy (Stockfish wanted 4.e3), and 4...g4. Now the pawn attacked my knight.

Stockfish didn't think much of 2...g5 itself: an inaccuracy, from +0.07 to +0.68 for me, with 2...d5 as its choice. The danger came from how many of my pieces that one pawn could hit. It touched the bishop on f4, then the knight on f3.

Position 1: move 5, the knight I left attacked

r n b q k . n r
p p p p . p b p
. . . . p . . .
. . . . . . . .
. . . P . . p .
. . . . . N B .
P P P . P P P P
R N . Q K B . R

The checker explains my idea: the bishop on e5 attacks Black's bishop on g7, and behind it the rook on h8. It looked active. But my knight on f3 was attacked by the pawn on g4, and moving the bishop did nothing about it. Black answered 5...f6, attacking the bishop too. Now two of my pieces were attacked by pawns at the same time.

Stockfish's choice was the plain retreat 5.Ng1, rated "slightly better for white" in today's check. Going backwards with a developed knight on move 5 doesn't feel like opening play, but it was the only way to keep the material even. After my bishop move the saved evaluation was -3.99.

Position 2: move 6, a bishop for a pawn

r n b q k . n r
p p p p . . b p
. . . . p p . .
. . . . B . . .
. . . P . . p .
. . . . . N . .
P P P . P P P P
R N . Q K B . R

Here every move was bad. Today's check rates Stockfish's best, the bishop back to f4, as "black is winning" (-3.37); the line has Black taking my knight on f3. I took the pawn on f6 instead. The checker notes the threats, against the bishop on g7 and the queen on d8, and then the catch: the bishop can now be captured. Black's knight took it. The evaluation went to -7.12. Then my knight finally left f3, to d2.

So the real mistake was one move earlier. On move 5 I could save everything with one retreat. On move 6 I could only choose which piece to lose.

Position 3: move 9, the pawn push I skipped

Black didn't keep the advantage for long. 7...c6 and 8.e4 kept Black winning, and then 8...Qa5 was a blunder (to -1.86). I had a chance to make the position close to normal.

r n b . k . . r
p p . p . . b p
. . p . p n . .
q . . . . . . .
. . . P P . p .
. . . . . . . .
P P P N . P P P
R N . Q K B . R

Stockfish wanted 9.e5, the central pawn push that attacks the knight on f6. I played 9.c3, a blunder in the record (from -1.86 to -4.52). The pawn move gained no time. Black blundered back with 9...c5, and on move 10 I did push e5. The knight went to d5, another Black blunder, and suddenly I was +2.50.

Position 4: move 11, the wrong pawn to take

r n b . k . . r
p p . p . . b p
. . . . p . . .
q . p n P . . .
. . . P . . p .
. . P . . . . .
P P . N . P P P
R N . Q K B . R

Black's g-pawn was still on g4, the pawn that started all this. I took it with my queen. It felt like getting some material back. The evaluation went from +2.50 to -3.54. Stockfish's choice was 11.Nc4: the knight from d2 attacks Black's queen on a5, which had no defender, and today's check keeps me "clearly better". Grabbing the pawn left Black's queen free.

That same knight move, Nc4, was Stockfish's first choice again on moves 12, 13 and 14. I'll tell that part on the collapse page.

The lesson of game 1768's opening

Against the Horwitz Defense with an early g5, the pawn is not the danger. Where my pieces stand when it arrives is. My bishop went to g3, my knight to f3, and that put both in reach of one pawn's march. When the pawn hit the knight, I had to answer that attack first.

My checklist from this opening is a short one. When a pawn attacks one of my pieces, the first question is where that piece goes, before any active idea. On move 5 the retreat to g1 was ugly and correct. On move 11 the capture on g4 was greedy and wrong, because a move that attacked the queen was available.

I met an early g5 against my London once before, in game 514, and won material there. The difference here was the knight on f3, already in the pawn's path. If you want to see how often your own openings go wrong this way, the beginner game-review guide shows the method, and the week 92 diary has every game around this one.

What came next

The very next game, 1769, was another Horwitz Defense with 2.Bf4, against tyhcd (1259). Black played 2...a6 and a g6 set-up, not g5, so it tells me nothing about this specific line. I won by resignation, with 78.5% accuracy in the opening. The early g5 test is still open. You can review your own games the same way with Chess Coach in Claude or ChatGPT, and the journey hub has the rest of the series.