Chess on Tablet

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Lessons

Lesson No.019

ECO D24 Black wins Opening: Intermediate Medium game, 31 moves Opening: Queen's Gambit Accepted

Black
hgfe dcba
8765 4321
1234 5678
abcd efgh
White
Highlight Battle Situation White: beige / Black: khaki / Both: red / None: blue

Explanation

Game Moves

Show best moves
# White Best Black Best
1 d4 e4 d5 d5
2 c4 c4 dxc4 e6
3 Nf3 e4 Nf6 Nf6
4 Nc3 e3 a6 a6
5 Bf4 e4 b5 b5
6 g3 a4 e6 Bb7
7 Bg5 Bg2 Be7 Nbd7
8 b3 Bg2 b4 b4
9 bxc4 Na4 bxc3 bxc3
10 Qa4+ Bg2 Bd7 Nbd7
11 Qc2 Qc2 c5 c5
12 Bg2 Bg2 Nc6 Nc6
13 dxc5 Qxc3 Rc8 Qa5
14 a3 O-O Qa5 Qa5
15 Qd3 Rd1 O-O O-O
16 Nd4 O-O Ne5 Nxd4
17 Qxh7+ Qc2 Kxh7 Kxh7
18 c6 Nb3 Kh8 Nxc6
19 O-O cxd7 Nxc6 Nxc6
20 Nb5 Bxf6 c2 axb5
21 Bh4 a4 Nh7 axb5
22 Na7 Be4 Bxh4 Bxh4
23 Be4 Nxc8 Nxa7 Nxa7
24 f4 Bxc2 Be7 Qc5+
25 Rf3 Rf3 g6 Qc5+
26 Rd1 g4 cxd1=Q+ cxd1=Q+
27 Kf2 Kg2 Qae1+ Qae1+
28 Kg2 Kg2 Qexe2+ Qexe2+
29 Kh3 Kh3 Qh1 Qxe4
30 Kg4 f5 f5+ f5+
31 Kh3 Bxf5 Qhxh2# Qhxh2#

Detailed Analysis

Evaluation Chart

Evaluation: How good the position is, in pawns (1 pawn = 1.0). + (blue) means you are better, − (red) means your opponent is. Capped at ±10. Touch a point to see the actual value.
◆ Mate: A position with checkmate in sight (shown at ±10). Touch a point to see the moves to checkmate (M3: you mate in 3, -M3: your opponent mates in 3).

Skill Radar

Estimated from engine evaluations. It may not match your actual strength.

How Scores Work: For each move, the winning chance (calculated from the evaluation) before and after the move is compared; the less it drops, the higher the move's accuracy. Each item is the average accuracy of its moves (out of 100). Items with fewer than 3 moves show (-) (Tactics is scored from a single move).
Opening Moves 1 to 10
Tactics Moves right after the opponent dropped their winning chance by 10% or more (did you take the chance?)
Strategy Moves other than Opening, Endgame and Tactics
Endgame Moves once both sides together have 8 or fewer pieces other than kings and pawns
Consistency Share of all moves that did not drop the winning chance by 10% or more

* The win % and accuracy formulas are based on Lichess's calculations.

Win % and Accuracy

Win %: Your chance of winning (0–100), calculated from the evaluation after each move.
Accuracy: For each of your moves, a score (0–100) comparing your winning chance before and after the move. A move that keeps your winning chance scores 100.

Evaluation Chart

Evaluation: How good the position is, in pawns (1 pawn = 1.0). + (blue) means you are better, − (red) means your opponent is. Capped at ±10. Touch a point to see the actual value.
◆ Mate: A position with checkmate in sight (shown at ±10). Touch a point to see the moves to checkmate (M3: you mate in 3, -M3: your opponent mates in 3).

Skill Radar

Estimated from engine evaluations. It may not match your actual strength.

How Scores Work: For each move, the winning chance (calculated from the evaluation) before and after the move is compared; the less it drops, the higher the move's accuracy. Each item is the average accuracy of its moves (out of 100). Items with fewer than 3 moves show (-) (Tactics is scored from a single move).
Opening Moves 1 to 10
Tactics Moves right after the opponent dropped their winning chance by 10% or more (did you take the chance?)
Strategy Moves other than Opening, Endgame and Tactics
Endgame Moves once both sides together have 8 or fewer pieces other than kings and pawns
Consistency Share of all moves that did not drop the winning chance by 10% or more

* The win % and accuracy formulas are based on Lichess's calculations.

Win % and Accuracy

Win %: Your chance of winning (0–100), calculated from the evaluation after each move.
Accuracy: For each of your moves, a score (0–100) comparing your winning chance before and after the move. A move that keeps your winning chance scores 100.
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