H#3: A single piece (White or Black) makes three moves, the last of which is a switchback.
See also: Switchback.
Onkoud, Abdelaziz
J. Kapros MT, 2025
3rd Prize
1.Qxe5+
Bxe5
2.Rc4
Bd6
3.Kxd4
Be5#
1.Rxe5+
Rxe5
2.Qf3
Rf5
3.Kxe4
Re5#
FEN: 4b3/3Rpp1p/1pp1p1B1/rRr1P2K/1p1PP1n1/3kn1q1/5b1B/8
External links:
Onkoud, Abdelaziz
Azerbaijan-Morocco, 2014
2nd Place
1.Qe6
Ra4
2.Qxc4
Ra5
3.Qe6
Bd3#
1.Sxe5
Ba4
2.Sxc4
Bb3
3.Se5
Rf4#
Onkoud, Abdelaziz
The Problemist Supplement, 2026
1.Qf3
Sfxe3
2.Qxf6
Sxc4
3.Qf3
Sce3#
1.Rf3
Sgxe3
2.Rxf6
Sxc4
3.Rf3
Sce3#
FEN: 7B/5p2/5P2/1p2P1p1/1Rp1k1p1/2ppn1r1/2b3Np/3q1N1K
Meinking, Dan
U.S. Problem Bulletin, 1993 (v)
1.Rg3
Rf3
2.Qf5
Rxf5
3.Rg2
Rf3#
1.Rf3
Re3
2.Rg3
Rxe6
3.Rg2
Re3#
1.Qg4
Bf5
2.Rd3
Bxd3
3.Qg2
Bf5#
1.Qf5
Be6
2.Qg4
Bxb3
3.Qg2
Be6#
FEN: 8/3B4/2P1q3/8/P6p/Rr5k/4P2n/K7