In opposite-coloured bishop endings the defending side often holds the draw even against two extra passers: the bishop plants itself in front of one pawn on a square of its own colour while the king guards the other.
Here White has the king on e4, the bishop on b7 and two passers on a6 and d5; Black has the king on d6 and the bishop on a7. White to move, and it is a draw (per the tablebases): Black blockades both pawns and neither can advance.
The lesson: for two passers to win with opposite-coloured bishops they have to be far enough apart that king and bishop cannot stop both. Here they are not - the blockade holds.
Drag a piece onto the board, or click a piece and then click the squares. The cross beside the pieces sweeps every piece of that colour off the board, and a single piece can be dragged off the edge.
The pieces will be arranged into the chosen pattern.
It is the mating side to move. Find mate in one.
Openings, endgame positions and breakthrough studies - the set-up appears on the board.
Often yes: the king blockades one and the bishop the other along its diagonal. The essential thing is that the pawns are not on squares of the opponent's bishop's colour.
The right division of roles, and staying still: any shuffling of the pieces can open a road for a pawn.
When the pawns are far apart and both can advance - then there are not enough pieces to go round.
Build your own position in the board editor, read up on the rules of chess or run a tournament on your own positions in the free app.
Pairings are computed by bbpPairings, an open-source engine implementing the Dutch system by FIDE rules: score groups, floats on an odd field, colour alternation. Free to use.
proper rounds with correct pairings, not random matchups
a full circle, with the round count derived from the field
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