rnr5/2pp1pkp/8/pnp1b3/P1P1pp1P/4P3/3PN1P1/RNB1K3 w Q - 0 20
FEN state: rnr5/2pp1pkp/8/pnp1b3/P1P1pp1P/4P3/3PN1P1/RNB1K3 w Q - 0 20 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black knight at b8 and black rook at c8. Black pawn at c7, black pawn at d7, black pawn at f7, black king at g7 and black pawn at h7. Black pawn at a5, black knight at b5, black pawn at c5 and black bishop at e5. White pawn at a4, white pawn at c4, black pawn at e4, black pawn at f4 and white pawn at h4. White pawn at e3. White pawn at d2, white knight at e2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1 and white king at e1. White queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.