MESON Chess Problem Database

Problem Display
PID: 138788 (3RnR2/4k1N1/8/1K6/Q7/8/8/8 w - - 0 1)

Grinchenko, Dmitry

Comm., StrateGems 01. Miniature Ty., 2010

3RnR2/4k1N1/8/1K6/Q7/8/8/8

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Sf6
      • 2.Qa3#
      • 2.Qb4#
  • Tries
    • 1.Kb6?
      • threat
        • 2.Qxe8#
      • 1...Kxd8
        • 2.Rxe8#
        • 2.Qxe8#
      • 1...Sxg7
        • 2.Qd7#
      • 1...Sd6
        • 2.Qd7#
        • 2.Qh4#
      • 1...Sf6
        • 2.Qa3#
        • 2.Qb4#
      • 1...Sc7
        • 2.Qd7#
        • 2.Qa3#
        • 2.Qb4#
        • 2.Qh4#
      • 1...Kxf8!
    • 1.Rf7+?
      • 1...Kxd8
        • 2.Qa8#
      • 1...Kxf7!
    • 1.Qa3+?
      • 1...Sd6+
        • 2.Qxd6#
      • 1...Kxd8!
    • 1.Qb4+?
      • 1...Sd6+
        • 2.Qxd6#
      • 1...Kxd8!
    • 1.Qf4?
      • threat
        • 2.Rfxe8#
      • 1...Sd6+
        • 2.Qxd6#
      • 1...Sc7+
        • 2.Qxc7#
      • 1...Sxg7
        • 2.Qd6#
        • 2.Qf6#
        • 2.Qf7#
      • 1...Sf6
        • 2.Qe5#
        • 2.Qd6#
        • 2.Qb4#
        • 2.Qxf6#
      • 1...Kxd8!
    • 1.Qh4+?
      • 1...Sf6
        • 2.Qxf6#
        • 2.Qb4#
      • 1...Kxf8!
  • Keys
    • 1.Qa7+!
      • 1...Kxd8
        • 2.Rxe8#
      • 1...Kxf8
        • 2.Rxe8#
      • 1...Sc7+
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • QAR1(A),XS(b)
      • Vars
        • S(b);XS(C)::QAR1(A)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT,XR(E)
    • Try
      • R(E);CHECK
      • Vars
        • K(a);S_FLIGHT,XR(D)::QAR(A)
      • Refutation
        • K(a);P-FLIGHT,XR(E)
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);CHECK,N_GUARD,P_SPINS(b)::QAB1(A),XS(b)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT,XR(D)
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);CHECK,N_GUARD,P_SPINS(b)::QAB1(A),XS(b)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT,XR(D)
    • Try
      • Q(A);
      • Threat
        • R1(E),XS(b)
      • Vars
        • S(b);CHECK,N_GUARD::QAB1(A),XS(b)
        • S(b);CHECK,N_GUARD::QAR2(A),XS(b)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT,XR(D)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT,XR(E)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(a);P_SPINS(b),S_FLIGHT,XR(D)::R1(E),XS(b)
      • K(a);P_SPINS(b),S_FLIGHT,XR(E)::R1(D),XS(b)
      • S(b);CHECK,N_GUARD,P_SPINS(b)::QAR2(A),XS(b)
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