13 May 08
Originally posted by curseknightYes... therefore the previous moves cannot have been d4-d5+, e7-e5, d5xe6 e.p.+, since White cannot have played d4-d5 while his own King was in check. Therefore, the first position is illegal.
bPe7 would put wKd6 in check.
With the wK->d7 the previous moves can/must have been (in order to reach the position) d4-d5+, e7-e5. d4xe6 e.p.+.
I welcome better thought out explanations.
(on a sidenote, 'can have been', is there a better construction to say this?)
13 May 08
1 edit
Originally posted by heinzkat"were possibly" might be useful there. Good problem, at first I could not see how en passant was possible, forgetting the pawn check.
Yes... therefore the previous moves cannot have been d4-d5+, e7-e5, d5xe6 e.p.+, since White cannot have played d4-d5 while his own King was in check. Therefore, the first position is illegal.
With the wK->d7 the previous moves can/must have been (in order to reach the position) d4-d5+, e7-e5. d4xe6 e.p.+.
I welcome better thought out explanations.
(on a sidenote, 'can have been', is there a better construction to say this?)