Chess Position
Position: What should Black play?
Bb5
r1k4N/ppqb4/6p1/3B1p2/2p5/3P1Q1P/PP3PP1/2R2RK1 b - -
1
2
3
4
5
6
7
h8
g
f
e
d
c
b
a
0
games in database
52%
28%
20%
⚪ White
½ Draw
⚫ Black
♟
Engine Evaluation
+9.60 d20
Bb5played by
👤
Humans
0%
🧠
Maia AI
0%
♟
Stockfish
#1
FEN
r1k4N/ppqb4/6p1/3B1p2/2p5/3P1Q1P/PP3PP1/2R2RK1 b - - 0 1💡
Why 
b6 ?❌ b6?? — blunder
EVAL:
[██████████]+13.26+9.60 → +13.26 (Loss: -3.66)
💡 Problem with b6:
By moving the c7 to b6, Black abandons the defense of the c4 pawn. This allows White to initiate a devastating sequence starting with a check on the open c-file.
⚖️ Comparison
| Coup | Eval | Rule | Verdict |
|---|---|---|---|
| ✅ b5! | +9.60 | ✓ Improve Piece Activity | Challenges the center and prepares to recycle the d7. |
| ❌ b6?? | +13.26 | ✗ King Safety | Exposes the  c8 to a direct tactical assault. |
⚡ Opponent's Punishment
After b6:
- →
xc4+ delivers a crushing check, forcing the c8 to move. - → Black loses: Total control of the queenside and faces a decisive material deficit after d8 e1.
📚 Lesson: Never remove a defender from a critical file when your King is already under pressure.
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