Ponderchess / Openings
Play the guided film, or select a scene to pause and study its position.
Opening
The Colle System in 3D
The Colle System, following the Colle System: Pterodactyl Variation. Watch how each move fights for the centre and develops the pieces.
Rebuild the sequence yourself. The board responds to each move, and hints are available.
Click or drag to move · Arrow keys + Enter to play
Your turn · white to play
Select a piece, then its destination. Switch to 2D for a clear overhead view or rotate the 3D board to explore the position.
Colle System: Pterodactyl Variation, move by move: d4 g6 Nf3 Bg7 e3 c5 Bd3 Qa5+
Colle System: Pterodactyl Variation, move by move: d4 g6 Nf3 Bg7 e3 c5 Bd3 Qa5+
Keyboard: Space pauses, the arrow keys step. Gold arrows are White's moves, violet are Black's, red rays are threats, green shows support, blue shows plans.
