MESON Chess Problem Database

Problem Display
PID: 197723 (8/3pB2Q/R1q1kN2/2Pp4/2PP2R1/8/b7/7K w - - 0 1)

Valve, Leo Erland

1st Comm., Suomen Shakki, 1974-1975

8/3pB2Q/R1q1kN2/2Pp4/2PP2R1/8/b7/7K

#2

9 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Rxd6#
    • 1...Bb1
      • 2.cxd5#
    • 1...dxc4+
      • 2.Re4#
  • Tries
    • 1.Bd8?
      • threat
        • 2.Qxd7#
      • 1...dxc4+
        • 2.Re4#
      • 1...d6!
    • 1.Rg3?
      • threat
        • 2.Re3#
      • 1...Bb1
        • 2.cxd5#
      • 1...dxc4+!
    • 1.Rg5?
      • threat
        • 2.Re5#
      • 1...dxc4+
        • 2.d5#
      • 1...d6!
    • 1.Rxc6+?
      • 1...d6
        • 2.Rxd6#
      • 1...dxc6!
  • Keys
    • 1.Rg7!
      • threat
        • 2.Qh3#
      • 1...dxc4+
        • 2.Qe4#
      • 1...Bb1
        • 2.cxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATE::R1(F),XQ(c)
    • B(a);N_GUARD::P(B),XP(b)
    • P(b);CHECK,N_GUARD,XP(B)::R(D)
  • Tries
    • Try
      • B(H);
      • Threat
        • QAB1(I),XP(e)
      • Vars
        • P(b);CHECK,N_GUARD,XP(B)::R(D)
      • Refutation
        • P(e);N_SPINQ(c)
    • Try
      • R(D);
      • Threat
        • R(D)
      • Vars
        • B(a);N_GUARD::P(B),XP(b)
      • Refutation
        • P(b);CHECK,XP(B)
    • Try
      • R(D);
      • Threat
        • R1(D)
      • Vars
        • P(b);CHECK,OGATE,XP(B)::P(C)
      • Refutation
        • P(e);N_SPINQ(c)
    • Try
      • R(F);CHECK,XQ(c)
      • Vars
        • P(e);P_SPINP(e)::R1(F),XP(e)
      • Refutation
        • P(e);XR(F)
  • Actual
    • R(D);
    • Threat
      • QAB(I)
    • Vars
      • P(b);CHECK,N_GUARD,XP(B)::QAR2(I)
      • B(a);N_GUARD::P(B),XP(b)
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