MESON Chess Problem Database

Problem Display
PID: 190312 (b7/8/Q7/1pP5/1Kpk4/2R5/1B5b/1B6 w - - 0 1)

Muha, Boris

Suomen Shakki, 1983

b7/8/Q7/1pP5/1Kpk4/2R5/1B5b/1B6

#2

6 + 5

3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qd6#
    • 1...Be4
      • 2.Rd3#
  • Tries
    • 1.Rg3+?
      • 1...Kd5
        • 2.Qd6#
      • 1...c3!
    • 1.Rxc4+?
      • 1...Kd5
        • 2.Be4#
      • 1...Ke3!
    • 1.Qc6?
      • threat
        • 2.Rd3#
      • 1...Ke5
        • 2.Rxc4#
        • 2.Qd6#
      • 1...Bxc6!
    • 1.Qe6?
      • threat
        • 2.Rd3#
        • 2.Rxc4#
      • 1...Be4
        • 2.Rd3#
        • 2.Qxe4#
      • 1...Be5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Rd3#
      • 1...Kd5
        • 2.Qe4#
      • 1...Ke5
        • 2.Qd6#

This anticipates 255050(1984)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(c);S_FLIGHT::QAB1(F)
    • B(e);SBLOCK::B(B)+R(C),DCHECK
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(F)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • R(C);CHECK,XP(b)
      • Vars
        • K(c);P-FLIGHT::B(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(F);
      • Threat
        • B(B)+R(C),DCHECK
      • Refutation
        • B(e);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Refutation
        • B(a);
  • Actual
    • Q(F);
    • Threat
      • B(B)+R(C),DCHECK
    • Vars
      • K(c);P-FLIGHT::QAB1(F)
      • K(c);S_FLIGHT::QAB1(F)
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