MESON Chess Problem Database

Problem Display
PID: 133725 (8/8/8/2Rp4/1n6/pk1N4/3QK3/8 w - - 0 1)

Grivans, Edwin David

Sacha Pasaule, 1972

8/8/8/2Rp4/1n6/pk1N4/3QK3/8

#2

4 + 4

23 Die Schwalbe 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Qxb4#
    • 1...Sa2
      • 2.Qd1#
      • 2.Qc2#
    • 1...Sc2
      • 2.Qxc2#
    • 1...Sa6
      • 2.Qc2#
    • 1...Sc6
      • 2.Qc2#
    • 1...a2
      • 2.Qxb4#
  • Tries
    • 1.Rc1?
      • threat
        • 2.Sc5#
      • 1...Ka4
        • 2.Qxb4#
      • 1...Sc2
        • 2.Qxc2#
      • 1...a2
        • 2.Qxb4#
      • 1...Sa6
        • 2.Qc2#
      • 1...Sxd3!
    • 1.Rb5?
      • threat
        • 2.Rxb4#
      • 1...Ka4
        • 2.Qxb4#
      • 1...Kc4
        • 2.Rxb4#
        • 2.Qxb4#
      • 1...a2!
    • 1.Qc3+?
      • 1...Ka4
        • 2.Qxb4#
      • 1...Ka2!
    • 1.Qd1+?
      • 1...Sc2
        • 2.Qxc2#
      • 1...Ka2!
    • 1.Qb2+?
      • 1...Ka4
        • 2.Qxb4#
      • 1...axb2!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Rxb4#
      • 1...Ka4
        • 2.Qxb4#
      • 1...Kxc4
        • 2.Qxb4#
      • 1...Sxd3
        • 2.Qc2#
      • 1...dxc4
        • 2.Sc5#
      • 1...a2
        • 2.Qxb4#
      • 1...Sa2
        • 2.Qc2#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Sa6
        • 2.Qc2#
      • 1...Sc6
        • 2.Qc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAR1(A),XS(c)
    • S(c);N_GUARD::QAB1(A),XS(c)
    • S(c);N_GUARD::QAB1(A)
    • P(a);SBLOCK::QAR1(A),XS(c)
  • Tries
    • Try
      • R(D);
      • Threat
        • S(C)
      • Vars
        • K(b);S_FLIGHT::QAR1(A),XS(c)
        • S(c);N_GUARD::QAB1(A),XS(c)
        • P(a);SBLOCK::QAR1(A),XS(c)
        • S(c);N_GUARD::QAB1(A)
      • Refutation
        • S(c);XS(C)
    • Try
      • R(D);P_PINS(c)
      • Threat
        • R1(D),XS(c)
      • Vars
        • K(b);N_SPINS(c),S_FLIGHT::QAR1(A),XS(c)
      • Refutation
        • P(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR1(A),XS(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(A),XS(c)
      • Refutation
        • P(a);XQ(A)
  • Actual
    • R(D);
    • Threat
      • R1(D),XS(c)
    • Vars
      • K(b);P_SPINS(c),S_FLIGHT::QAR1(A),XS(c)
      • K(b);S_FLIGHT,XR(D)::QAR1(A),XS(c)
      • S(c);N_GUARD,XS(C)::QAB1(A)
      • P(d);SBLOCK,XR(D)::S(C)
      • P(a);SBLOCK::QAR1(A),XS(c)
      • S(c);N_GUARD::QAB1(A)
      • S(c);N_GUARD::QAB1(A),XS(c)
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