MESON Chess Problem Database

Problem Display
PID: 876 (2N1n3/3pPp2/N2q1B2/3k4/2R5/3B4/PQ6/3K4 w - - 0 1)

Turnbull, Ronald

British Chess Magazine, 1993

2N1n3/3pPp2/N2q1B2/3k4/2R5/3B4/PQ6/3K4

#2

9 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Qe5#
    • 1...Qb4
      • 2.Qe5#
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qxa6
      • 2.Qe5#
    • 1...Qb6
      • 2.Qe5#
    • 1...Qc6
      • 2.Qe5#
    • 1...Qe6
      • 2.Sb4#
      • 2.Rc5#
      • 2.Qd4#
      • 2.Qb5#
  • Tries
    • 1.Sb4+?
      • 1...Qxb4
        • 2.Qe5#
      • 1...Ke6!
    • 1.Sb6+?
      • 1...Qxb6
        • 2.Qe5#
      • 1...Ke6!
    • 1.Sxd6?
      • threat
        • 2.Qe5#
      • 1...Kxd6
        • 2.Qe5#
      • 1...Ke6
        • 2.Qe5#
      • 1...Sxf6!
    • 1.Rd4+?
      • 1...Kc6
        • 2.Sa7#
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ke6!
    • 1.Qb5+?
      • 1...Ke6
        • 2.Qf5#
      • 1...Qc5!
  • Keys
    • 1.Rc6!
      • 1...Kxc6
        • 2.Qb5#
      • 1...Ke6
        • 2.Qe5#
      • 1...Qxe7
        • 2.Sxe7#
      • 1...Qxc6
        • 2.Qe5#
      • 1...Qxf6
        • 2.Sb4#
      • 1...Sxf6
        • 2.Rxd6#
      • 1...dxc6
        • 2.Qb3#
      • 1...Qh2
        • 2.Sb4#
        • 2.Qb5#
      • 1...Qa3
        • 2.Qg2#
      • 1...Qg3
        • 2.Sb4#
        • 2.Qb5#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Qf4
        • 2.Qb5#
      • 1...Qc5
        • 2.Qg2#
      • 1...Qe5
        • 2.Sb4#
      • 1...Qc7
        • 2.Sb4#
        • 2.Qg2#
        • 2.Qb5#
      • 1...Qb8
        • 2.Qg2#
      • 1...Qe6
        • 2.Sb4#
        • 2.Rc5#
        • 2.Qb5#
      • 1...Sc7
        • 2.Rxd6#
      • 1...Sg7
        • 2.Rxd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 11
    • REMOVED MATES = 2
  • Sets
    • Q(b);N_GUARD::QAR1(C)
    • Q(b);N_GUARD::QAR1(C),XQ(b)
    • Q(b);N_GUARD,XS(F)::QAR1(C)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • Q(b);XS(F)::QAR1(C)
      • Refutation
        • K(a);P_PINB(D),S_FLIGHT
    • Try
      • S(I);CHECK
      • Vars
        • Q(b);XS(I)::QAR1(C)
      • Refutation
        • K(a);P_PINB(D),S_FLIGHT
    • Try
      • S(I);XQ(b)
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT,XS(I)::QAB1(C)
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • S(e);XB(G)
    • Try
      • R(E);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,P_PINB(D),S_FLIGHT::QAB1(C)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • R(E);
    • Vars
      • K(a);P_PINB(D),S_FLIGHT,XR(E)::QAB1(C)
      • K(a);P_PINB(D),P_SPINQ(b),S_FLIGHT::QAR1(C)
      • Q(b);XP(H)::S(I),XQ(b)
      • Q(b);N_GUARD,SBLOCK,XR(E)::QAR1(C)
      • Q(b);N_GUARD,XB(G)::S(F)
      • S(e);N_GUARD,XB(G)::R1(E),XQ(b)
      • P(c);SBLOCK,XR(E)::QAB(C)
      • Q(b);::QAB(C)
      • Q(b);N_GUARD::S(F),XQ(b)
      • Q(b);N_GUARD::QAR2(C)
      • Q(b);N_GUARD::S(F)
      • S(e);N_GUARD::R1(E),XQ(b)
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