The default shortcuts are:

Table 3.1. Shortcuts

Finish the current gameF
Get new games uploaded by other users Ctrl+G
Load saved game Ctrl+O
Pass a moveP
Quit Ctrl+Q
Redo a move that was undone Ctrl+Shift+Z
Save the current game Ctrl+S
Start a new game Ctrl+N
Start new or loaded gameS
Toggle move numbers visibilityN
Undo your last move Ctrl+Z
What's this? Shift+F1