At some point someone will need to teach Gemini that # is the same as ++ and it's checkmate, and definitly not a blunder!

[daSilva65]

[Event "5 12 r"]
[Site FICS"]
[Date "2001.02.05"]
[Round "?"]
[White "JohnnyCastro"]
[Black "martinus"]
[Result "0-1"]
[ECO "D00"]
[EventDate "2001.??.??"]
[PlyCount "48"]
[FlipB "1"]
[Annotator "Stockfish 17 (4 sec)"]

1.d4 d5 2.e3 e6 { Move out of book Nf6 100% 29:+0.11} 3.f4 { 29:-0.23}
3...f5 { 28:+0.10} 4.Bd3 { 29:-0.08} 4...Nf6 { 31:+0.16} 5.Nf3 { 26:+0.17}
5...Bd6 { 28:+0.23} 6.c3 { 27:-0.21} 6...O-O { 27:-0.20} 7.O-O { 29:-0.25}
7...Bd7 { 27:+0.15} 8.Nbd2 { 26:-0.02} 8...Be8 { 27:+0.15} 9.Ne5 {
28:-0.20} 9...Bh5 { 27:+0.19} 10.Qe1 { 25:-0.12} 10...Ne4 { 27:+0.05} 11.
Ndf3 { 28:+0.04} 11...Nd7 { 26:+0.15} 12.Nxd7 { 28:-0.20} 12...Qxd7 {
30:-0.12} 13.Ne5 { 31:-0.14} 13...Qd8 { 28:-0.10} 14.Bd2 { 24:-0.61} 14...
c6 { 28:+0.04} 15.b4 { 26:-0.28} 15...a5 { 28:+0.25} 16.a3 { 27:-0.30}
16...axb4 $201 { 27:-0.21} 17.axb4 $4 $21 { 29:-4.33 VERDICT: axb4 is a
blunder according to the engine analysis.
The engine preferred the move cxb4, leading to a score of +0.00. Instead,
axb4 results in a score of -4.33. The best line suggests 17.cxb4 Bxe5
18.dxe5. This move clears the path for White's queen and bishop to
pressure Black's position, while axb4 allows Black to capture and improve
their piece activity.}
( 17.cxb4 {27:-0.21} 17...Bxe5 18.dxe5 Nxd2 19.Qxd2 b6 20.Rfc1 Qc7 21.
a4 c5 22.bxc5 bxc5 23.Bc2 Ra5 24.h3 Rfa8 25.Kh2 Be8 $10 )
17...Rxa1 { 27:-4.14} 18.Qxa1 { 28:-4.01} 18...Nxd2 { 29:-3.90} 19.Rf2 {
29:-4.13} 19...Ne4 { 29:-4.08} 20.Re2 { 30:-7.10} 20...Bxe2 { 29:-7.61}
21.Bxe2 $201 { 30:-7.73} 21...Qh4 $4 $21 { 28:-5.94 VERDICT: Qh4 is a
blunder according to the engine analysis.
The best line was Bxe5. The engine prefers this move because it leads to a
significant advantage for Black, with the evaluation dropping from -5.94
to -7.73 after Qh4, indicating a lost position for White.}
( 21...Bxe5 {30:-7.73} 22.dxe5 Qb6 23.Qc1 g5 24.g3 gxf4 25.gxf4 Kh8
26.Kg2 Rg8+ 27.Kf1 Qd8 28.Qe1 Qa8 29.b5 Qa2 30.b6 $21 )
22.Nf3 { 29:-9.61} 22...Qf2+ { 30:-9.73} 23.Kh1 { 29:-9.79} 23...Qxe2 {
31:-9.85} 24.Ne1 { 245:M-1} 24...Qf1# {VERDICT: Qf1# is a blunder
according to the engine analysis.

The engine analysis indicates that Qf1# is a blunder. The primary reason
is that it allows White's King to escape the check and avoid mate. The
engine's preferred move was not provided as it appears there was no top
line move for Black in this exact position.

GAME SUMMARY:
The game began with White employing a Queen's Pawn Game setup, leading to
a relatively balanced early and middle game. White built a steady, albeit
small, advantage in the early stages, peaking at +0.79 after 9. Ne5. Black
responded by improving piece activity and centralizing pieces, reaching a
more equal footing. The turning point occurred around move 15. Black
played 15. a5, which the engine evaluated as an inaccuracy, dropping the
score from +0.36 to -0.59. This move allowed White to gain a pawn
advantage and control of the position. White consistently maintained and
increased their lead from this point onwards. After 18. Qxa1, White held a
significant advantage of +2.07. Black attempted to complicate the game in
the late stages, but White's superior position allowed them to press their
advantage. The engine scores show White's advantage growing steadily until
the final move. The accuracy of the engine's analysis is not provided for
this final position. The game concluded with Qf1#, a move that, despite
appearing to deliver checkmate, was not the strongest option and resulted
in the game's end.} 0-1

[whelanh]

Yes, unfortunately it appears to be an inherent limitation of LLM models at the moment. I am viewing the auto-comment buttons as experimental (despite my best efforts to improve the prompts used). I view the comments it creates as a "bad first draft." 🤣