Ludwig Zagler, Chess Ultimates 12/1974
[FEN "3nBb2/3PRP2/2ppPPpp/2nk2pb/2p2QN1/1r1rBKP1/7q/8 w - - 0 0"]
self=1, 7 solutions
This is the record (7 variants) for forced single side selfstalemates. I expect that Zagler, who even made a systematic for one-mover records, also did the duplex version (any move for both sides selfstalemates), but could not dig it up on the existing databases.
Since one white and one black selfstalemate can be easily done with 8 pieces, please give at least 3 overall (or a link to an existing record).