MESON Chess Problem Database

Problem Display
PID: 159959 (kB6/r1p5/2K5/8/8/8/6B1/1Q1n4 w - - 0 1)

Andrew, Frederick William

Stratford Express, 0000

kB6/r1p5/2K5/8/8/8/6B1/1Q1n4

#2

4 + 4

15351 SCPF/BCPS Black Books 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Kxc7#
      • 2.Qb7#
    • 1...Ra2
      • 2.Qb7#
    • 1...Ra3
      • 2.Qb7#
    • 1...Ra4
      • 2.Qb7#
    • 1...Ra5
      • 2.Qb7#
    • 1...Rb7
      • 2.Qxb7#
  • Tries
    • 1.Kc5+?
      • 1...Rb7
        • 2.Qxb7#
      • 1...c6!
    • 1.Kd7+?
      • 1...Rb7
        • 2.Qxb7#
      • 1...c6+!
    • 1.Bxa7?
      • threat
        • 2.Qb7#
        • 2.Qb8#
      • 1...Kxa7
        • 2.Qb7#
      • 1...Sb2!
    • 1.Qa2?
      • threat
        • 2.Qxa7#
      • 1...Ra6+
        • 2.Kxc7#
      • 1...Kxb8
        • 2.Qg8#
      • 1...Ra3
        • 2.Kxc7#
      • 1...Ra4
        • 2.Kxc7#
      • 1...Ra5
        • 2.Kxc7#
      • 1...Rxa2!
    • 1.Qb6?
      • threat
        • 2.Qxa7#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Ra2
        • 2.Qb7#
      • 1...Ra1
        • 2.Kxc7#
        • 2.Qb7#
      • 1...Ra3
        • 2.Qb7#
      • 1...Ra4
        • 2.Qb7#
      • 1...Ra5
        • 2.Qb7#
      • 1...Ra6
        • 2.Kxc7#
      • 1...cxb6!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qxa7#
      • 1...Ra6+
        • 2.Kxc7#
      • 1...Kxb8
        • 2.Qh8#
      • 1...Rxa1
        • 2.Kxc7#
      • 1...Ra2
        • 2.Kxc7#
      • 1...Ra3
        • 2.Kxc7#
      • 1...Ra4
        • 2.Kxc7#
      • 1...Ra5
        • 2.Kxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD::QAB1(A)
    • R(b);N_GUARD::QAB1(A),XR(b)
  • Tries
    • Try
      • K(C);CHECK,P-FLIGHT
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(A),XR(b)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • K(C);CHECK,S_FLIGHT
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(A),XR(b)
      • Refutation
        • P(c);CHECK,P_SPINP(c)
    • Try
      • B(D);XR(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P-FLIGHT,XB(D)::QAR1(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);P_PINR(b)
      • Threat
        • QAR1(A),XR(b)
      • Vars
        • R(b);CHECK::B(B)+K(C),XP(c)
        • K(d);N_SPINR(b),OGATEB,P-FLIGHT,XB(D)::QAR(A)
        • R(b);::B(B)+K(C),XP(c)
      • Refutation
        • R(b);N_SPINR(b),XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XR(b)
      • Vars
        • R(b);N_GUARD::QAB1(A),XR(b)
        • R(b);N_GUARD::QAB1(A)
        • R(b);P_PINQ(A)::B(B)+K(C),XP(c)
      • Refutation
        • P(c);XQ(A)
  • Actual
    • Q(A);P_PINR(b)
    • Threat
      • QAR1(A),XR(b)
    • Vars
      • R(b);CHECK::B(B)+K(C),XP(c)
      • K(d);N_SPINR(b),OGATEB,P-FLIGHT,XB(D)::QAR(A)
      • R(b);N_SPINR(b),XQ(A)::B(B)+K(C),XP(c)
      • R(b);::B(B)+K(C),XP(c)
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