cwbowron has updates his Chess game for the PSP. Chages are :

moves print use modified put char from sdk to display using lower and uppercase

new feature for beginner players (and others):

option: hilite checks – default off – shows the threatenings piece(s) when in check. (red mask)

option: show available – default off – shows the possible moves for the piece under the cursor or the selected start piece. (green mask)

option: show threats – default off – hilite pieces that are currently under threat (blue mask)

http://forums.ps2dev.org/viewtopic.php?t=1760