Chess on Tablet

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Lessons

Lesson No.010

ECO D08 Black wins Opening: Intermediate Medium game, 30 moves Opening: Queen's Gambit Declined

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 e5 e6
3 dxe5 dxe5 d4 d4
4 Nf3 Nf3 Nc6 Nc6
5 Bf4 Nbd2 f6 Nge7
6 g3 exf6 g5 g5
7 e6 Bd2 gxf4 gxf4
8 a3 Bh3 Bxe6 Bxe6
9 b4 Nbd2 Bg7 Qd7
10 Bg2 Nbd2 Nh6 Nge7
11 Qd2 b5 Bxc4 O-O
12 O-O Qxf4 O-O O-O
13 Qc2 Qxf4 Bd5 Bf7
14 Nbd2 Rd1 fxg3 Ne5
15 hxg3 hxg3 d3 d3
16 Qd1 Qxd3 Ne5 Re8
17 Re1 Nxe5 Rf7 c6
18 b5 Nxe5 Rb8 Rb8
19 Nxe5 Nxe5 fxe5 fxe5
20 Ne4 exd3 c6 Bxe4
21 e3 Qxd3 Kh8 Bxe4
22 Rb1 Qxd3 Bxe4 Qe7
23 Qg4 Bxe4 Nxg4 Bxg2
24 f3 Bxe4 Rf8 Rf8
25 fxe4 Rf1 Bh6 Qg5
26 bxc6 Bh3 d2 d2
27 Bf3 Rf1 Rxf3 dxe1=Q+
28 a4 Kg2 Rxg3+ Rxg3+
29 Kf1 Kf1 Qd3+ Qd3+
30 Re2 Re2 Rf8# Rf8#

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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