MESON Chess Problem Database

Problem Display
PID: 132951 (3R4/5pQ1/p1R5/K2nrB2/3kN3/1p1p4/1P1Bn3/8 w - - 0 1)

Robertson, Rev Nevill

The Field, 1959

(First published on Thu Oct 1 1959)

3R4/5pQ1/p1R5/K2nrB2/3kN3/1p1p4/1P1Bn3/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Qg1#
    • 1...Sg1
      • 2.Qxg1#
    • 1...Sc3
      • 2.Qg1#
      • 2.bxc3#
    • 1...Sf4
      • 2.Qg1#
    • 1...f6
      • 2.Qa7#
  • Tries
    • 1.Kxa6?
      • 1...Sc1
        • 2.Qg1#
      • 1...Sg1
        • 2.Qxg1#
      • 1...Sc3
        • 2.Qg1#
        • 2.bxc3#
      • 1...Sf4
        • 2.Qg1#
      • 1...f6
        • 2.Qa7#
      • 1...Sg3!
    • 1.Sc3?
      • threat
        • 2.Rxd5#
      • 1...Sxc3
        • 2.bxc3#
      • 1...f6
        • 2.Qa7#
      • 1...Sf4!
    • 1.Sc5?
      • threat
        • 2.Sxb3#
      • 1...Kc4
        • 2.Se6#
      • 1...Sc1!
    • 1.Bc3+?
      • 1...Sxc3
        • 2.Qg1#
      • 1...Ke3!
    • 1.Bf4?
      • threat
        • 2.Qxe5#
      • 1...Sxf4
        • 2.Qg1#
      • 1...f6
        • 2.Qa7#
      • 1...d2!
    • 1.Rc5?
      • threat
        • 2.Rdxd5#
      • 1...Sc3
        • 2.Qg1#
        • 2.bxc3#
      • 1...Sf4
        • 2.Qg1#
      • 1...f6!
    • 1.Rcc8?
      • 1...Sc1
        • 2.Qg1#
      • 1...Sg1
        • 2.Qxg1#
      • 1...Sc3
        • 2.Qg1#
        • 2.bxc3#
      • 1...Sf4
        • 2.Qg1#
      • 1...f6
        • 2.Qa7#
      • 1...Sg3!
    • 1.Rdd6?
      • 1...Sc1
        • 2.Qg1#
      • 1...Sg1
        • 2.Qxg1#
      • 1...Sc3
        • 2.Qg1#
        • 2.bxc3#
      • 1...Sf4
        • 2.Qg1#
      • 1...f6
        • 2.Qa7#
      • 1...Sg3!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Rc4#
      • 1...Sdc3+
        • 2.Sb5#
      • 1...Se3+
        • 2.Sb5#
      • 1...Sb4+
        • 2.Sb5#
      • 1...Sdf4+
        • 2.Sb5#
      • 1...Sb6+
        • 2.Sb5#
      • 1...Sf6+
        • 2.Sb5#
      • 1...Sc7+
        • 2.Sb5#
      • 1...Se7+
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 4
  • Sets
    • S(a);N_GUARD::QAB(G)
    • S(a);N_GUARD::QAB(G),XS(a)
    • P(h);N_SPINR(f),OGATE::QAB(G)
  • Tries
    • Try
      • K(D);P-FLIGHT,XP(g)
      • Vars
        • S(a);N_GUARD::QAB(G)
        • S(a);N_GUARD::QAB(G),XS(a)
        • P(h);N_SPINR(f),OGATE::QAB(G)
      • Refutation
        • S(a);
    • Try
      • S(C);
      • Threat
        • R1(H),XS(e)
      • Vars
        • S(a);OGATE,XS(C)::P(A),XS(a)
        • P(h);N_SPINR(f),OGATE::QAB(G)
      • Refutation
        • S(a);
    • Try
      • S(C);
      • Threat
        • S(C),XP(b)
      • Vars
        • K(d);N_SPINR(f),N_SPINS(e),P-FLIGHT::R(F)+S(C)
      • Refutation
        • S(a);
    • Try
      • B(B);CHECK
      • Vars
        • S(a);XB(B)::QAB(G)
      • Refutation
        • K(d);N_SPINR(f),N_SPINS(e),S_FLIGHT
    • Try
      • B(B);
      • Threat
        • QAB1(G),XR(f)
      • Vars
        • S(a);N_GUARD,XB(B)::QAB(G)
        • P(h);N_SPINR(f),OGATE::QAB(G)
      • Refutation
        • P(c);
    • Try
      • R(F);
      • Threat
        • R1(H),XS(e)
      • Vars
        • S(a);N_GUARD::QAB(G)
      • Refutation
        • P(h);N_SPINR(f)
    • Try
      • R(F);
      • Vars
        • S(a);N_GUARD::QAB(G)
        • S(a);N_GUARD::QAB(G),XS(a)
        • P(h);N_SPINR(f),OGATE::QAB(G)
      • Refutation
        • S(a);
    • Try
      • R(H);
      • Vars
        • S(a);N_GUARD::QAB(G)
        • S(a);N_GUARD::QAB(G),XS(a)
        • P(h);N_SPINR(f),OGATE::QAB(G)
      • Refutation
        • S(a);
  • Actual
    • S(C);N_PINS(e)
    • Threat
      • R1(F)
    • Vars
      • S(e);CHECK::R(H)+S(C),DCHECK
      • S(e);CHECK,N_SPINR(f)::R(H)+S(C),DCHECK
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