Amin Tabatabaei's opening repertoire on Chess.com, as White and Black

From the latest games of this time control (up to 150 per colour), counted directly from the moves and clocks, with no engine. Each bar is the share of games where the situation happened; the isolated pawn and the closed centre are counted in games instead. A share on its own is neither good nor bad. A tag appears only on the time-trouble and endgame rows, in blitz and bullet, and only when the result is clear at 90% confidence: the score is above or below what the ratings predict (for the endgame rows, the ratings and the material). The percent on a tag is score points: scoring 50% where the ratings predict 59% shows as −9%.

Out of book by move 3

Games where the position stops matching any named opening (the ECO list) within each side’s first three moves, by either player’s move. Counted over all games.

Fianchetto

Games where, after move 10, the player has a bishop on g2 or b2 (g7 or b7 as Black) with the pawn in front of it on g3 or b3 (g6 or b6). Counted over games that lasted 10 moves.

Open centre

Games with at most one pawn, of either colour, on d4, d5, e4 and e5 after move 12. Counted over games that lasted 12 moves.

Semi-open centre

Games with two pawns, of either colour, on d4, d5, e4 and e5 after move 12. Counted over games that lasted 12 moves.

Closed centre

Games with three or four pawns, of either colour, on d4, d5, e4 and e5 after move 12. Counted over games that lasted 12 moves.

Isolated queen’s pawn

Games where, after move 12, the player has exactly one pawn on the d-file and none on the c- or e-file. It can happen with any of the centres. Counted over games that lasted 12 moves.

Opposite-side castling

Games where both kings castled, to different sides — often a race of pawn storms. Counted over games where both kings castled.

Queens off by move 20

Games where both queens were off the board by move 20. Counted over games that lasted 20 moves or had the queens off sooner.

Time trouble

Games where, after move 10, the player’s clock fell under 10% of the starting time with at least five of their moves still to play. Counted over games that have move times. When a tag shows, it compares the result in those games with what the ratings predict.

Ahead on material in the endgame

Games that reached an endgame with the player at least two points up (two pawns, the exchange or more; pawn 1, minor piece 3, rook 5, queen 9), counted when six or fewer queens, rooks, bishops and knights are left in total. When a tag shows, it compares the result with what the ratings and the material predict.

Behind on material in the endgame

Games that reached an endgame with the player at least two points down (two pawns, the exchange or more; pawn 1, minor piece 3, rook 5, queen 9), counted when six or fewer queens, rooks, bishops and knights are left in total. When a tag shows, it compares the result with what the ratings and the material predict.