MESON Chess Problem Database

Problem Display
PID: 48056 (k4B2/5P2/Kp6/8/8/8/1Q2r3/8 w - - 0 1)

Ivunin, Alexey Vsevolodovich

Stepanov, Petr Aleksandrovich

Problemist Pribuzhya, 1990

k4B2/5P2/Kp6/8/8/8/1Q2r3/8

#2

4 + 3

4883 Still More Fun with Chess Miniatures 2002
145 StrateGems 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Re8
      • 2.fxe8Q#
      • 2.fxe8R#
  • Tries
    • 1.Qd2?
      • threat
        • 2.Qd8#
      • 1...Kb8
        • 2.Qd8#
      • 1...Re8
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Rxd2!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Be7#
      • 1...Ra2+
        • 2.Ba3#
      • 1...Kb8
        • 2.Bd6#
      • 1...Rc2
        • 2.Bc5#
      • 1...Rd2
        • 2.Bd6#
      • 1...Rg2
        • 2.Bg7#
      • 1...Rh2
        • 2.Bh6#
      • 1...Re7
        • 2.Bxe7#
      • 1...Re8
        • 2.fxe8Q#
        • 2.fxe8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(a);OGATE::PXR(a)=Q
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(c);P-FLIGHT::QAR2(A)
        • R(a);OGATE::PXR(a)=Q
      • Refutation
        • R(a);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)+B(D)
    • Vars
      • R(a);CHECK,N_GUARD::QAR(A)+B(D)
      • K(c);P-FLIGHT::QAR(A)+B(D),DCHECK
      • R(a);N_GUARD::QAR(A)+B(D)
      • R(a);::QAR(A)+B(D),XR(a)
      • R(a);OGATE::PXR(a)=Q
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