MESON Chess Problem Database

Problem Display
PID: 103770 (b7/1R6/8/8/r7/2P5/8/k1K3Q1 w - - 0 1)

Shakhnazaryan, Albert Serapionovic

Shak-M, 1990

b7/1R6/8/8/r7/2P5/8/k1K3Q1

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Rb1#
    • 1...Ra7
      • 2.Rxa7#
      • 2.Qxa7#
  • Tries
    • 1.Qf2?
      • threat
        • 2.Rb1#
        • 2.Qb2#
      • 1...Bxb7
        • 2.Qb2#
      • 1...Ra2
        • 2.Rb1#
      • 1...Rb4!
    • 1.Qh2?
      • threat
        • 2.Rb1#
        • 2.Qb2#
      • 1...Bxb7
        • 2.Qb2#
      • 1...Ra2
        • 2.Rb1#
      • 1...Rb4!
    • 1.Qb6?
      • threat
        • 2.Qb1#
        • 2.Qb2#
      • 1...Ka2
        • 2.Qb2#
      • 1...Ra2
        • 2.Qb1#
      • 1...Rb4!
    • 1.Qg2?
      • threat
        • 2.Rb1#
        • 2.Qb2#
      • 1...Bxb7
        • 2.Qb2#
      • 1...Ra2
        • 2.Rb1#
      • 1...Rb4!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qxa4#
      • 1...Ka2
        • 2.Qxa4#
      • 1...Rxa7
        • 2.Rxa7#
      • 1...Ra3
        • 2.Qxa3#
      • 1...Ra2
        • 2.Rb1#
      • 1...Ra5
        • 2.Qxa5#
      • 1...Ra6
        • 2.Qxa6#

This anticipates 88770(1992)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(b);SBLOCK::R1(D)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);XR(D)::QAB1(B)
        • R(b);::R1(D)
      • Refutation
        • R(b);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);XR(D)::QAB1(B)
        • R(b);::R1(D)
      • Refutation
        • R(b);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
        • R(b);::QAR1(B)
      • Refutation
        • R(b);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);XR(D)::QAB1(B)
        • R(b);::R1(D)
      • Refutation
        • R(b);
  • Actual
    • Q(B);P_PINR(b)
    • Threat
      • QAR(B),XR(b)
    • Vars
      • K(a);P-FLIGHT::QAR2(B),XR(b)
      • R(b);N_SPINR(b),OGATE,XQ(B)::R(D),XR(b)
      • R(b);OGATE::QAR2(B),XR(b)
      • R(b);::R1(D)
      • R(b);OGATEB::QAR(B),XR(b)
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