Lesson No.002

ECO D07 Black wins Opening: Intermediate Medium game, 34 moves Opening: Queen's Gambit Declined

Black

hgfe dcba

8765 4321

1234 5678

abcd efgh

White

Explanation

Game Moves

Show best moves

#	White	Best	Black	Best
1	d4	e4	d5	d5
2	c4	c4	Nc6	e6
3	Nc3	Nf3	e6	e5
4	Nf3	e3	Nf6	Nf6
5	a3	Bg5	Be7	Ne4
6	e3	Bf4	Ne4	O-O
7	Nxe4	Nxe4	dxe4	dxe4
8	Nd2	Nd2	f5	f5
9	b4	b4	b6	O-O
10	Qh5+	Qh5+	g6	g6
11	Qd1	Qd1	O-O	O-O
12	Bb2	Bb2	Nb8	Bb7
13	Be2	c5	c5	Nd7
14	O-O	dxc5	cxd4	cxb4
15	Qb1	Bxd4	d3	d3
16	Bh5	Bd1	gxh5	gxh5
17	Qd1	f3	Bf6	Bb7
18	Bxf6	Bxf6	Rxf6	Qxf6
19	Nb3	c5	Nd7	Nc6
20	Qd2	c5	f4	Bb7
21	h3	f3	e5	Bb7
22	Rac1	exf4	Nf8	Bb7
23	a4	c5	Rf7	Rg6
24	c5	exf4	f3	Be6
25	Qb2	g3	Bxh3	Qh4
26	b5	Qxe5	Qg5	fxg2
27	g3	g3	h4	h4
28	cxb6	Kh1	axb6	axb6
29	Rc5	Kh1	hxg3	hxg3
30	Na1	Rfc1	gxf2+	gxf2+
31	Kxf2	Kxf2	Qh4+	Qg2+
32	Kg1	Kg1	Rg7+	Rg7+
33	Qg2	Kh1	Rxg2+	Rxg2+
34	Kh1	Kh1	Bg4#	Be6#

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.