MESON Chess Problem Database

Problem Display
PID: 161680 (3k4/r3R3/2PN4/1Q4K1/8/8/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1996

3k4/r3R3/2PN4/1Q4K1/8/8/8/8

#2

5 + 2

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Rd7#
    • 1...Ra2
      • 2.Rd7#
    • 1...Ra3
      • 2.Rd7#
    • 1...Ra4
      • 2.Rd7#
    • 1...Ra5
      • 2.Rd7#
    • 1...Ra6
      • 2.Rd7#
    • 1...Rc7
      • 2.Re8#
    • 1...Rd7
      • 2.Rxd7#
    • 1...Rxe7
      • 2.Qb8#
    • 1...Ra8
      • 2.Rd7#
  • Tries
    • 1.Kf6?
      • threat
        • 2.Qb8#
      • 1...Rc7
        • 2.Re8#
      • 1...Ra8
        • 2.Rd7#
        • 2.Qb6#
        • 2.c7#
      • 1...Rb7!
    • 1.Rb7?
      • threat
        • 2.Qb6#
      • 1...Ra5
        • 2.Rd7#
        • 2.Qxa5#
      • 1...Ra6
        • 2.Rd7#
      • 1...Rxb7!
    • 1.Qb6+?
      • 1...Rc7
        • 2.Rd7#
        • 2.Re8#
        • 2.Qxc7#
      • 1...Kxe7!
    • 1.c7+?
      • 1...Rxc7
        • 2.Re8#
        • 2.Qe8#
      • 1...Kxe7!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qf8#
      • 1...Kxe7
        • 2.Qf6#
      • 1...Rxe7
        • 2.Qc8#
      • 1...Rd7
        • 2.Rxd7#
        • 2.Qxd7#
      • 1...Ra5
        • 2.Rd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • R(a);N_GUARD::R1(E)
    • R(a);N_GUARD,P_PINQ(A)::R1(E)
    • R(a);SBLOCK::R1(E)
    • R(a);N_GUARD::R1(E),XR(a)
    • R(a);SBLOCK,XR(E)::QAR2(A)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAR2(A)
      • Vars
        • R(a);SBLOCK::R1(E)
      • Refutation
        • R(a);
    • Try
      • R(E);
      • Threat
        • QAB(A)
      • Vars
        • R(a);N_GUARD::R1(E)
      • Refutation
        • R(a);XR(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • P(C);CHECK
      • Refutation
        • K(b);S_FLIGHT,XR(E)
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XR(E)::QAB1(A)
      • R(a);SBLOCK,XR(E)::QAR1(A)
      • R(a);N_GUARD,P_PINQ(A)::R1(E)
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