MESON Chess Problem Database

Problem Display
PID: 232927 (3q1k2/4r3/4Q1K1/8/1R6/B7/8/8 w - - 0 1)

Evdokimov, Aleksey

Kudesnik, 2011

3q1k2/4r3/4Q1K1/8/1R6/B7/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qb8
      • 2.Rxb8#
    • 1...Ra7
      • 2.Rf4#
    • 1...Rb7
      • 2.Rf4#
    • 1...Rc7
      • 2.Rf4#
    • 1...Rd7
      • 2.Rf4#
    • 1...Rf7
      • 2.Qxf7#
    • 1...Rh7
      • 2.Rf4#
    • 1...Re8
      • 2.Rf4#
      • 2.Qf7#
  • Tries
    • 1.Qxe7+?
      • 1...Kg8
        • 2.Qxd8#
        • 2.Qg7#
      • 1...Qxe7
        • 2.Rb8#
      • 1...Kxe7!
  • Keys
    • 1.Rb8!
      • threat
        • 2.Rxd8#
        • 2.Qf7#
      • 1...Qe8+
        • 2.Qf7#
      • 1...Ke8
        • 2.Qxe7#
      • 1...Qxb8
        • 2.Qf7#
      • 1...Qc8
        • 2.Rxc8#
        • 2.Qf7#
        • 2.Qxc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(b);OGATEB::R(B),XQ(b)
    • R(a);::B(A)+R(B),DCHECK
    • R(a);N_GUARD::QAR1(C),XR(a)
  • Tries
    • Try
      • Q(C);CHECK,XR(a)
      • Vars
        • Q(b);XQ(C)::R(B)
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
  • Actual
    • R(B);P_PINQ(b),P_PINR(a)
    • Threat
      • DUALS(2)
    • Vars
      • Q(b);CHECK::QAR1(C)
      • K(c);P-FLIGHT::QAR1(C),XR(a)
      • Q(b);N_SPINQ(b),XR(B)::QAR1(C)
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