r1b1k1n1/1p1p1qpr/nPp4p/4p3/2P1P1P1/1N2bQ1P/5PB1/R3K1NR b q - 2 21
FEN state: r1b1k1n1/1p1p1qpr/nPp4p/4p3/2P1P1P1/1N2bQ1P/5PB1/R3K1NR b q - 2 21 ; Best move: e3b6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black knight at g8. Black pawn at b7, black pawn at d7, black queen at f7, black pawn at g7 and black rook at h7. Black knight at a6, white pawn at b6, black pawn at c6 and black pawn at h6. Black pawn at e5. White pawn at c4, white pawn at e4 and white pawn at g4. White knight at b3, black bishop at e3, white queen at f3 and white pawn at h3. White pawn at f2 and white bishop at g2. White rook at a1, white king at e1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 21. Black to move.