The winners, who had solved all the problems, were the following :

(1)

**Pountzas**Chrysanthos, 53 minutes,

(2)

**Gerogiannis**Christodoulos, 1 hour and 9 minutes

(3)

**Skoularikis**Fotios, 1 hour and 17 minutes.

Try to solve the problems without seeing the analytical explanations in the end of this post. If your time is under one hour and a half, then you may consider yourself as very good solver.

(Problem 100) N. Kossolapov “Novosty”, 1963 Mate in 2, #2 (6+1) | |

[2K4Q/8/2S5/1k6/3B4/8/P5P1/8] |

(Problem 101) M. Lipton, Second Honorary Mention, “Israel Problemists’ Assn. Tourney”, 1955 (There is set play). Mate in 3, * #3 (4+3) | |

[k1K5/1p2R3/q7/3B4/8/4B3/8/8] |

(Problem 102) H. Lepuschütz, “Deutsche Schachzeitung“, 1936 Mate in 6, #6 (6+15) | |

[2r5/P2R4/K6R/Spk3pp/p2p1p1r/P2p4/1p5b/3bs2s] |

(Problem 103) H. Mattison, First-Second Prize, “Schachmatny Listok”, 1929 White plays and wins, + (4+4) | |

[8/6k1/1PPR4/2r5/7p/7b/3K4/8] |

(Problem 104) E. A. Wirtanen, First Prize, “Leipzig Olympic Tourney”, 1960 (There is set play). Selfmate in 2, * s#2 (11+8) | |

[4S3/3p2S1/1p1P1pP1/1R1bk1Pp/7p/3BK2Q/1r3P2/B7] |

(Problem 105) L. I. Loshinski, First Prize, “Problem”, 1973 Helpmate in 5, h#5 (2+14) | |

[b7/pk4q1/pp1s2r1/1r3p1K/4p3/3p1s1B/4p3/8] |

**Solutions of the problems**

**Problem-100, Kossolapov, #2**

Phases of virtual play : Tries : {1.Qe5+? / Qh5+? / Qd8? Kc4!}, {1.Qg8? Kxc6!}, {1.Qf8?, if 1...Ka4 / Ka6 / Kc6 then 2.Qb4 / Qf1 / Qc5, but 1...Kc4!}.

Phase of actual play :

**Key : 1.Qh3!**

1...Ka4 / Ka6 / Kc6 / Kc4 2.Qb3 / Qd3 / Qd7 / Qb3

Theme X-flights of bK. Three changed mates.

**Problem-101, Lipton, * #3**

Phase of set play : (*) 1...Qc4 / Qe6 / Qc6 2.BxQ (

**grabbing**).

Phases of virtual play : Tries : {1.Re4? Qc4!}, {1.Re8?, if 1...Qc4 / Qe6 2 Kd7 / Kc7, but 1...Qb6!} (royal battery).

Phase of actual play :

**Key : 1.Rb7!**Qc4 / Qe6 / Qc6 2.Rc7 / Rd7 / Rc7

The composer presents here the theme

**Brede**in a Zagoruiko frame.

Theme Brede cross-checks : Every black check is answered with white check that pins the white piece, which then is unpinned and delivers mate. |

**Problem-102, Lepuschütz, #6**

Phases of virtual play : Tries : {1.Rd5+ Kxd5!}, {1.a8=Q/R? Rxa8+!}, {1.Rc6+? Rxc6+!}, {1.Sb7+? Kc4!}, {1.Rb6? b1=Q/R!}, {1.Rd6? Bf3!}, {1.Re6? f3!}, {1.Rf6? Bg4!}.

Phase of actual play :

**Key : 1.Rg6!**Rg4

2.Rf6 Sg3

3.Re6 Sf3

4.Rd6 Bb3

5.Rb6 Rb8

6.Rc6#

**Problem-103, Mattison, +**

**Key : 1.b7!**Rb5

2.Rd8 Bg2

3.b8=Q Rb8

4.c7! Rb2

5.Kc1! Rb6

6.Rg8 Kh6

7.Rg2 Rc6

8.Rc2 (+–)

**Problem-104, Wirtanen, * s#2**

Phase of set play : (*)

1...f5 2.f3 f4#

1...g5 2.f4 gxf4#

Phase of actual play :

**Key : 1.Qh4!**

1...f5 2.Qh5 f4#

1...g5 2.Qf4 gxf4#

We see two changed mates here.

**Problem-105, Loshinski, h#5**

Obviously the mate is given by the wB. Where can the bK be cornered?

**Key : 1.a5!**Bg4

2.Ka6 Bf5

3.Bd5 Be6

4.Sf5 Bd7

5.Bf7 Bc8#

(This post in Greek language).