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MatPlus.Net Forum General Sentinels with neutral pawns (Sentinelles en Pion neutre)
 
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(1) Posted by Geoff Foster [Wednesday, Feb 13, 2008 03:16]

Sentinels with neutral pawns (Sentinelles en Pion neutre)


Christian Poisson gives the following definition of "Sentinelles en Pion neutre": When a piece (not a Pawn) moves, a neutral Pawn appears on the vacated square if it is not on the first or the last rank, and if there are less than 8 neutral Pawns on the board.

This is not how Popeye implements "Sentinelles PionNeutre", so I asked Stephen Emmerson about it. His reply was: The normal rule for sentinels is that when a neutral piece is moved, it leaves a white pawn when moved by white and a black pawn when moved by black. 'Neutral P' sentinels means a white/black/neutral piece leaves a white/black/neutral pawn respectively (maximum 8 of each).

Which definition is correct?
 
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(2) Posted by Jacques Rotenberg [Wednesday, Feb 13, 2008 06:23]; edited by Jacques Rotenberg [08-02-13]

What explained you Emmerson is how can work Sentinel (usual) with neutral pieces :
1) Main rule : when a neutral piece moves the pawn it leaves (if it leaves one) is of the colour of the playing side - that moved this neutral piece.
2) Secondary rule : a neutral piece leaves a neutral pawn following the usual restrictions of Sentinel. And works as you say.

But there are other types of sentinel :

"Sentinelles en pion adverses" = Sentinel to pawns of the opponent. It works like sentinel but the pawns left are of the opposite colour

"Sentinelles en pion neutres" = Sentinel to neutral pawn. It works like sentinel but the pawns left are neutral.
 
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MatPlus.Net Forum General Sentinels with neutral pawns (Sentinelles en Pion neutre)