1.Ba3? d5 2.Qb1 threat 3.Qb2# but 2...Kd4!
1.Qxd6? Kb3 2.Qa3+ Kc2 3.Qb2# but 1...Kc2!
1.Qe2! Kb3/d5? 2.Qxc4/Qb2# 1...Kb4 2.Qxc4+ Ka5 3.Qb5#
1...Kd4 2.Qe6? c3/Kc3/d5 3.Be3/Qxc4/Qe3# but 2...Kc5!
2.Qe3+ Kd5 3.Bg2#
b) 1.Qe2? Kd4? 2.Qe3# 1...Kb4 2.Qxc4+ Ka5 3.Qb5# but 2...dxc4!
1.Be2? d4 2.Qd2+ Kb3 3.Bd1# but 1...Kb4!
1.Ba3! d4 2.Qa4? threat 3.Qxc4# but 2...d3!2.Qe2? d3 3.Qb2# but 2...Kb3! 2.Qb1 d3 3.Qb2#
c) 1.Ba3? threat 2.Qb1 threat 3.Qb2# but stalemate!
1.Be3? Kb2 2.Bxc4 Kc3,Ka3 3.Qb3# but 1...Kb4!
1.Qe2! Kb4 2.Qa2? Kb5! 2.Qxc4+ Ka5 3.Qb5#
1...Kd4 2.Bg2? threat 3.Qe3# 2...c3 3.Qe4# but 2...Kc3!
2.Qe3+? Kd5 3.Bg2+ Kd6! 2.Qe6! c3 3.Be3# 2...Kc3 3.Qxc4#
All starting positions differ only minimally from each other, which is considered ideal for twins. This represents a novelty for homebase triplets and above (quadruplets and so forth), even beyond seven pieces and at least for the genre of directmates.
Keywords: homebase (w), characteristic twins (triplet!), 2 flights giving & 1 flight taking key, changed continuations/mates, battery creation/destruction/play, selfblock, switchback (k)
Award: Commendation. Judge: Ferhat Karmil (Batumi, Georgia)
