MESON Chess Problem Database

Problem Display
PID: 22555 (1R6/3p4/p1NPp3/1pk1P1p1/2PR4/P5K1/3P1P2/6BB w - - 0 1)

Hoffmann, Fritz

HM., Vecherni Leningrad, 1986

1R6/3p4/p1NPp3/1pk1P1p1/2PR4/P5K1/3P1P2/6BB

#2

12 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.axb4#
    • 1...a5
      • 2.Rxb5#
  • Tries
    • 1.Sa5?
      • threat
        • 2.Sb3#
      • 1...bxc4
        • 2.Rxc4#
      • 1...Kxd4!
    • 1.Rd5+?
      • 1...Kxc4
        • 2.Sa5#
      • 1...Kxc6
        • 2.Rdxb5#
      • 1...exd5!
    • 1.f4?
      • 1...gxf4+
        • 2.Rxf4#
      • 1...bxc4
        • 2.Rd3#
      • 1...dxc6
        • 2.Re4#
      • 1...b4
        • 2.axb4#
      • 1...a5
        • 2.Rxb5#
      • 1...g4!
  • Keys
    • 1.Rg4!
      • 1...bxc4
        • 2.f4#
      • 1...dxc6
        • 2.f3#
      • 1...b4
        • 2.axb4#
      • 1...a5
        • 2.Rxb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATE::P(E),XP(a)
    • P(d);N_GUARD::R1(L),XP(a)
  • Tries
    • Try
      • S(J);
      • Threat
        • S(J)
      • Vars
        • P(a);OGATE,XP(G)::R1(H),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(H)
    • Try
      • R(H);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(G)::S(J)
        • K(b);OGATE,P-FLIGHT,XS(J)::B(B)+R(H),XP(a)
      • Refutation
        • P(e);XR(H)
    • Try
      • P(D);
      • Vars
        • P(c);CHECK,OGATE,XP(D)::B(A)+R(H),XP(c)
        • P(a);SBLOCK,XP(G)::B(A)+R(H)
        • P(f);SBLOCK,XS(J)::B(A)+R(H)
        • P(a);OGATE::P(E),XP(a)
        • P(d);N_GUARD::R1(L),XP(a)
      • Refutation
        • P(c);
  • Actual
    • R(H);
    • Vars
      • P(a);SBLOCK,XP(G)::B(A)+P(D)
      • P(f);SBLOCK,XS(J)::B(A)+P(D)
      • P(a);OGATE::P(E),XP(a)
      • P(d);N_GUARD::R1(L),XP(a)
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