A clean strike: Alberto C.'s pawn topples the pawn on D3.

Alpha Bat answers by moving the rook from F5 to G5. From D3 to E4, Alberto C.'s pawn swallows Alpha Bat's pawn.

With dungeon cunning, Alpha Bat brings the knight to E5. From A4, Alberto C.'s queen forces Alpha Bat to defend.

Alpha Bat's king advances from E8 to F8. From A4 to D4, Alberto C.'s queen swallows Alpha Bat's pawn.

Alpha Bat sets the bishop on E8, watching every square; then without hurry or fear, Alberto C. places the rook on C1. From the dark, Alpha Bat pushes the bishop to F7, and right after that alberto C.'s pawn takes A4, leaving A2 behind.

Alpha Bat answers by moving the rook from G5 to G6; then alberto C. slides the pawn across the board, from A4 to A5. With dungeon cunning, Alpha Bat brings the pawn to D5.

From D4 to D5, Alberto C.'s queen swallows Alpha Bat's pawn.

Alpha Bat's rook advances from G6 to G5. Alberto C. advances the queen from D5 to D4, while alpha Bat sets the bishop on G7, watching every square.

Without hurry or fear, Alberto C. places the queen on A4. From the dark, Alpha Bat pushes the rook to G6; then alberto C.'s pawn takes A6, leaving A5 behind.

Alpha Bat answers by moving the pawn from F4 to F3, and right after that alberto C. slides the pawn across the board, from A6 to A7. With dungeon cunning, Alpha Bat brings the king to G8.

Promotion: on A8, Alberto C. turns a pawn into a queen.

Alpha Bat's king advances from G8 to H7. Alberto C. advances the queen from A8 to D8, and alpha Bat sets the bishop on H6, watching every square.

A clean strike: Alberto C.'s queen topples the pawn on E7.

From the dark, Alpha Bat pushes the rook to G8. From E7 to H4, Alberto C.'s queen swallows Alpha Bat's pawn.

Alpha Bat answers by moving the bishop from F7 to H5. A clean strike: Alberto C.'s queen topples the bishop on H5.

With dungeon cunning, Alpha Bat brings the rook to B8. From C7, Alberto C.'s rook forces Alpha Bat to defend.

Alpha Bat's king advances from H7 to G8. Check: Alberto C. tightens the net by bringing the queen to E8.

Alpha Bat sets the bishop on F8, watching every square. Alberto C. gives check with the queen on G5.

From the dark, Alpha Bat pushes the king to H8. By taking the knight on E5, Alberto C. drives Alpha Bat into check.

Alpha Bat answers by moving the king from H8 to G8. Alberto C. delivers the final mate from E6.