| Theme: Task with Full Knight Wheel is the composition which has 8 thematic variations with a Knight reaching (with one step) eight different squares. |
In the next problems we see one full Knight wheel in Iatridis’s problem-63 and two full Knight wheels in Petrovic’s problem-64.
 | (Problem 63) Iatridis Stavros, ”To Skaki”, 1944 White plays and mates in 3 moves #2 (8+6) |
| [K5B1/2p5/2SP1k2/5P2/3Sp3/6s1/1Q1B2b1/s7] | |
The Olympic winner Stavros Iatridis presents a task with a full white-knight wheel, where the battery Qb2 with Sd4 is ready to fire:
Key: 1.Se7! (Nice key! It gives one more flight to the black King, and also unmasks the battery Pa4-Bg2 so, if pawn e4 moves, Bg2 checks the white King).
1...e3+ (but this move stops the guarding of g5 by the Bishop Bd2) 2.Sf3#
1...Se2 [2...Sc3] 2.Sxe2#
1...Sc2 [2...Sd4] 2.Sxc2#
1...Sb3 [2...Sd4] 2.Sxb3#
1...Ke5 2.Sb5#
1...cxd6 2.Sc6#
1...Kg7 2.Se6#
1...Sxf5 [2...Sd4] 2.Sxf5#
Two years after the publication of Iatridis’s problem, the excellent composer Nenad Petrovic presented a problem with two full Knight wheels, one full white-knight wheel and one full black-knight wheel! He was compelled to use all sixteen white pieces to achieve the double task, with an admirable result.
 | (Problem 64) Nenad Petrovic, ”The Chess”, 1946 White plays and mates in 2 moves #2 (16+6) |
| [3B2r1/2P3P1/KR3P1R/2PskS2/2P3p1/2P2PPB/1Q4S1/5s1r] | |
Try: {1.c8=Q? Re8!}
Key: 1.Rh5! (The Rook with the Knight form a battery, which gives mate if the Knight moves, for example 2.Sh6#)
| black S wheel | white S wheel |
| 1...Sxc7+ 2.Bxc7# | 1...Rxg7 2.Sxg7# |
| 1...Sxb6 2.Sd4# | 1...Rh8 2.Sh6# |
| 1...Sb4+ 2.cxb4# | 1...Rxh3 2.Sh4# |
| 1...Sxc3 2.Qxc3# | 1...Sxg3 2.Sxg3# |
| 1...Sde3 2.Sfxe3# | 1...Sfe3 2.Sfxe3# |
| 1...Sf4 2.gxf4# | 1...Sxb6 2.Sd4# |
| 1...Sxf6 2.Bxf6# | 1...gxf3 2.Sd6# |
| 1...Se7 2.Sxe7# | 1...Se7 2.Sxe7# |
[This post in Greek language].
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