11th ISC – Problems with Solutions – Category 1

1.Lf3?/Lg2? Sd2!/Se3!

1.Lh1! [5] (2.Sd5#)
1…S~ 2.Dc1:#
1…Sd2 2.e3#
1…Se3 2.Lg3#

Notation: King=K Queen=D Rook=T Bishop=L Knight=S Pawn=P

1.Lg7! (2.Tf7 [1] (3.Te7:#))
1…d5 2.Db3 [1] (3.cd5#) dc4/d4 3.Dc4:#/c5#
1…d6 2.Da6: [1] (3.Dc8#) de5 3.b7#
1…ab5 2.Da7 [1] (3.Dd7:#)
1…gf5 2.Dh3 [1] (3.gf5#) fg4/f4 3.Dg4:#/g5#

1.Sh4? (2.Sf3#) Sd2!

1.b7! (2.Db2+ Kc5 3.De5+ Kb6 4.Sc8+ [2,5] Tc8: 5.bc8S#)
1…Thh8 2.Sh4 (3.Sf3#) Sd2 3.Shf5+ gf5 4.Dg1+ [2,5] Kc3 5.Dg7:#

1.b6! [1] (i) Tg8 2.Sf6 [+1=2] (ii) Td8! (iii) 3.a7 [+1=3] (iv) Ta8 (v) 4.b7 [+1=4] (vi) Sd8! 5.ba8L! [+1=5] +- (e. g. 5…Sc6 6.Sd5 Sa7: 7.Se7 Sb5 8.Sg6+ Kg8 9.Ld5#) (vii)

(i) 1.a7? Tg8 2.b6 Sc5 3.Sf6 Ta8! 4.Kg6 Sb7 = (e. g. 5.Sd5 Kg8 6.Sc7 Tc8 7.Kf6 Kf8 8.Ke6 Td8 9.Sa6 Ta8 10.Kd7 Kf7 11.Sc7 Td8+ 12.Kc6 Sa5+ 13.Kb5 Sb7 =)
(ii) 2.a7? Sc5! 3.Sf6 Ta8 4.Sd5 Sd7 5.Sc7 Sb6: = ; 2.b7?? Sc5! -+
(iii) 2…Ta8 3.b7 Sd8 4.ba8L/S +-
(iv) 3.b7?? Sc5 -+
(v) 3…Sc5 4.Sd7! Sb7 (4…Sd7: 5.b7 +-) 5.Sb8 +- (e. g. 5…Td6+ 6.Kg5 Td5+ 7.Kf6 Ta5 8.Ke7 Kg7 9.Sc6 Ta6 10.Kd7 Sc5+ 11.Kd6 Sb7+ 12.Kc7 Sc5 13.Sb4 Ta5 14.Kc6 Kf7 15.Sa6! Sa6: 16.b7 Sb4+ 17.Kb6 Ta6+ 18.Kb5 Ta7: 19.b8D +-)
(vi) 4.Se8?! Sd8! 5.Sc7 Tc8 =
(vii) 5.b8D? Tb8: 6.ab8L Sf7+/Sc6 = ; 5.ba8S? Sc6! = ; 5.ba8D/T? =

1.Te4 Sd7 2.Kg6 g4 3.Kh7 g5 4.Lg6 Sf6# [2,5]
1.Tb7 Sh7 2.Le5 Ke3 3.Lg6 Kf3 4.Te6 g4# [2,5]

1.Lh2! (2.Dc4:+ Td4 3.Dd3+ Td3: 4.Sc3+ [1,25] Tc3:#)
1…Le6: 2.Sg3+ Kf4 3.Sf5+ Ke4 4.Sd6+ [1,25] ed6#
1…c3 2.Da4:+ Td4 3.Sg3+ Kf4 4.Sd3+ [1,25] Sd3:#
1…Sb6: 2.Lf3+ Kf5 3.g4+ Sg4: 4.Sd4+ [1,25] Ld4:#

1.Sb5:?/Sb7?/Se8? e4! ; 1.Se4? c3! ; 1.Sb8?/Sc5?/Sf8? e4!

1.Se5:? (2.Sdc4:#) Th8!
1…Ke5:/Le5:/Tf7: 2.Dg5#/Dg2:#/Sdf7:#

1.Sc4:! [5] (2.Sde5:#/Dd3#)
1…Kc4:/bc4/Tc4:+ 2.Sb6#/Td6#/Sc5#

Notation: King=K Queen=D Rook=T Bishop=L Knight=S Pawn=P

1.La7? De7!

1.Lb6! (2.Sd6:+ [1] Dd6:/Sd6: 3.Dg6/Te5:#)
1…Tg1: 2.Ld3+ [1] Kd5:/Kf3: 3.Td6:/Sh4#
1…Td5: 2.Te5:+ [1] Te5:/de5 3.Ld3/Ld5:#
1…Lf4: 2.Sg3:+ [1] Sg3:/Lg3: 3.Tf4:/Te3#
1…De7 2.Dg6 [1] (3.Sf~#)

1.f3? (2.d4#) Ta4:!

1.Sf8! (2.Sd7#) Kf6: 2.Sh7+ Ke5 3.Lc4 (4.d4+ Ke4 5.Sf6#) Se8 4.f3 (5.d4#) Lf5 5.f4+ [5] Lf4: 6.Sf3#

Alexandre V. PIKULIK
2nd-3rd Pl. Championship of USSR 1960

1.Tc4 [1] f5 2.Lf5: [+1=2] e1D 3.Te4+ Kd8 4.Kf8! [+1=3] (i) De3 5.Kf7! [+1=4] Db6: 6.Tc4 Db3 7.Le6 [+1=5] +-

(i) 4.Kf7? De3! 5.Te6 De5! 6.Te5: =

1.Sb2 e6 2.Td7+ ed7# [1,5]
1.Te7 Tf6+ 2.Ke5: Td6# [1,5]
1.De5: Lh7: 2.De6 Tg5:# [1,5]

For all three solutions: [5]

1.La4!
1…Lf6 2.De6:+ Ke6: 3.f8S+ Ke5 4.Tb5+ Ke4: 5.Sd6+ [2,5] Sd6:#
1…Lg7 2.Sc4+ Ke4: 3.Tg4+ Kd5 4.Sb6+ Ke5 5.Lg7:+ [2,5] Sfg7:#

Notation: King=K Queen=D Rook=T Bishop=L Knight=S Pawn=P