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Lessons

Lesson No.016

ECO D15 Black wins Opening: Intermediate Medium game, 30 moves Opening: Slav Defense

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 Nf6
2 c4 c4 c6 e6
3 Nf3 cxd5 Nf6 e6
4 Nc3 Nc3 g6 dxc4
5 h3 cxd5 Bg7 Bg7
6 Qc2 cxd5 a6 dxc4
7 a4 cxd5 Bf5 O-O
8 e4 Qb3 dxe4 Bxe4
9 g4 Nh4 exf3 exf3
10 gxf5 gxf5 a5 Qxd4
11 Qd3 Be3 Qd7 Na6
12 Bg5 Bg5 Qxf5 Qxf5
13 Qe3 Qxf5 h6 h6
14 Rg1 Bf4 hxg5 hxg5
15 Rxg5 Rxg5 Qc2 Qe6
16 d5 Rc1 Nbd7 Qxb2
17 Rd1 d6 Qxb2 Bh6
18 Qxf3 Rd4 Nxd5 Ng4
19 Nb5 Nxd5 Bc3+ cxb5
20 Nxc3 Nxc3 Nxc3 Qxc3+
21 Rxd7 Be2 Qc1+ Qc1+
22 Rd1 Rd1 Nxd1 Nxd1
23 Ke2 Qxd1 Nc3+ Nc3+
24 Qxc3 Qxc3 Qxc3 Qxc3
25 Bg2 Rd5 Qxc4+ Qxc4+
26 Kf3 Ke1 Qd3+ Qd3+
27 Kf4 Kf4 f6 f6
28 Bf3 Kg4 Rxh3 fxg5+
29 Rg3 Bxc6+ e5+ e5+
30 Kg4 Kg4 Qf5# Qf5#

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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