Every player may take an extra unit, not necessarily his own and not necessarily orthodox, and put this aside the board. Both players can have different pocket piece, e.g. white could have a pocket knight and black a pocket grasshopper.
These units name the variant in the following way:
a) if both players have the same unit X of their own, the variant is called "Pocket Xs", Pocket knights is the special case of this.
b) in other cases, if white have unit Y and black unit Z, the name of variant can be fairly complicated, in the above given example "White pocket: knight, Black pocket: grasshopper".
Once during the game, a player may put this extra unit on any free square on the board, instead of making a normal move. After this, this unit moves as is usual for this unit. All other rules are as in the usual chess game.
Note that there are generally no restrictions to the square where the pocket unit is placed, as long as this square is empty. Hence, e.g., it is allowed to put the unit on such a square, that check is given, mate is given, or, when a player is in check, between the checking piece and the king to remove the check.
However, the problems should conform to the following:
a) a pocket pawn cannot be put to the 1st or 8th rank,
b) a pocket rook put to a corner on its own side can castle,
c) in any case of potentially ambiguous rules for some situation the author of the problem should state the resolution of ambiguity (we don't expect troubles though, but authors should think about possible hazards while creating their problems). We will contact the author if we discover some difficulty.
3rd HM The Problemist November 1994
dedicated to Cedric Lytton
1.Sxc5! (threats 2.Se6#, Sxb3#) - note the double threat, the
defending pocket S can counter a single threat in so many different
ways that a double-threat will often be the most serviceable,
from "Scottish fairies"
The Problemist November 1996
a) Retract Ka7 (+R). Now if that bR just arrived as a pocket
one, Black can still castle. Otherwise not. 1...Kb6 2.0-0-0 pRa8
(mate as Black has *already deployed* his pR).
|white retracts for h#1,5 (1+2)|
c) = b) + e8 -» c8
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