MESON Chess Problem Database

Problem Display
PID: 108887 (8/5Bn1/2K1N1P1/5kp1/3PNPp1/3P1np1/6P1/5R1Q w - - 0 1)

Lider, Valentin Viktorovich

Northwest Chess, 1978

8/5Bn1/2K1N1P1/5kp1/3PNPp1/3P1np1/6P1/5R1Q

#2

11 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Sxg7#
    • 1...Sg1
      • 2.Sxg7#
    • 1...Sd2
      • 2.Sxg7#
    • 1...Sh2
      • 2.Sxg7#
    • 1...Sxd4+
      • 2.Sxd4#
    • 1...Sh4
      • 2.Sxg7#
    • 1...Se5+
      • 2.fxe5#
    • 1...gxf4
      • 2.Sxg7#
  • Tries
    • 1.Qh7?
      • 1...Sxd4+
        • 2.Sxd4#
      • 1...Se5+
        • 2.fxe5#
      • 1...gxf4
        • 2.Sxg7#
      • 1...Sh5
        • 2.g7#
      • 1...Se1
        • 2.Sxg7#
      • 1...Sg1
        • 2.Sxg7#
      • 1...Sd2
        • 2.Sxg7#
      • 1...Sh2
        • 2.Sxg7#
      • 1...Sh4
        • 2.Sxg7#
      • 1...Se8
        • 2.g7#
      • 1...Sxe6!
    • 1.fxg5?
      • threat
        • 2.Sxg3#
        • 2.Sd6#
      • 1...Sh5
        • 2.Sd6#
      • 1...Se8
        • 2.Sxg3#
      • 1...Sxe6!
  • Keys
    • 1.Qh8!
      • 1...Sxd4+
        • 2.Sxd4#
      • 1...Se5+
        • 2.fxe5#
      • 1...Sxe6
        • 2.Qf6#
      • 1...gxf4
        • 2.Sxg7#
      • 1...Sh5
        • 2.Sd6#
      • 1...Se1
        • 2.Sxg7#
      • 1...Sg1
        • 2.Sxg7#
      • 1...Sd2
        • 2.Sxg7#
      • 1...Sh2
        • 2.Sxg7#
      • 1...Sh4
        • 2.Sxg7#
      • 1...Se8
        • 2.Sxg3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);::S(I),XS(f)
    • S(a);CHECK,XP(E)::S(I),XS(a)
    • S(a);CHECK,OGATE::R(A)+P(G),XS(a)
    • P(e);SBLOCK,XP(G)::S(I),XS(f)
  • Tries
    • Try
      • Q(B);
      • Vars
        • S(a);CHECK,XP(E)::S(I),XS(a)
        • S(a);CHECK,OGATE::R(A)+P(G),XS(a)
        • P(e);SBLOCK,XP(G)::S(I),XS(f)
        • S(f);OGATE::QAB(B)+P(J)
        • S(a);::S(I),XS(f)
      • Refutation
        • S(f);XS(I)
    • Try
      • P(G);P_PINS(a),XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • S(f);::S(F)
        • S(f);::S(F),XP(b)
      • Refutation
        • S(f);XS(I)
  • Actual
    • Q(B);
    • Vars
      • S(a);CHECK,XP(E)::S(I),XS(a)
      • S(a);CHECK,OGATE::R(A)+P(G),XS(a)
      • S(f);OGATE,XS(I)::QAR1(B)
      • P(e);SBLOCK,XP(G)::S(I),XS(f)
      • S(f);::S(F)
      • S(a);::S(I),XS(f)
      • S(f);::S(F),XP(b)
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