MESON Chess Problem Database

Problem Display
PID: 275193 (8/B1R5/pP6/kr1QN1K1/P3R1P1/PPr5/8/8 w - - 0 1)

Lyness, Robert Cranston

British Chess Magazine, 1935

8/B1R5/pP6/kr1QN1K1/P3R1P1/PPr5/8/8

#2

11 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb3
      • 2.Sc6#
    • 1...Rd3
      • 2.Sc4#
      • 2.Sc6#
    • 1...Re3
      • 2.Sc4#
      • 2.Sc6#
    • 1...Rf3
      • 2.Sc4#
      • 2.Sc6#
    • 1...Rg3
      • 2.Sc4#
      • 2.Sc6#
    • 1...Rh3
      • 2.Sc4#
      • 2.Sc6#
    • 1...Rc4
      • 2.Sxc4#
    • 1...Rc6
      • 2.Sxc6#
    • 1...Rc5
      • 2.Sc6#
  • Tries
    • 1.Rec4?
      • threat
        • 2.Sc6#
      • 1...Rxc4
        • 2.Sxc4#
      • 1...Rxd5!
    • 1.Rcc4?
      • threat
        • 2.Sc6#
      • 1...Rxc4
        • 2.Sxc4#
      • 1...Rxd5!
    • 1.axb5?
      • threat
        • 2.Ra4#
      • 1...Rxb3
        • 2.Sc6#
      • 1...Rc4
        • 2.Sxc4#
      • 1...Rc5!
  • Keys
    • 1.Qd2!
      • 1...Rxe5+
        • 2.Rxe5#
      • 1...Rxb3
        • 2.Sc6#
      • 1...Rxb6
        • 2.Sc4#
      • 1...Rb4
        • 2.axb4#
      • 1...Rc5
        • 2.Rxc5#
      • 1...Rd5
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(a);N_GUARD,XP(B)::S(G)
    • R(a);N_GUARD::S(G),XR(a)
    • R(c);S_CUTR(a)::S(G)
  • Tries
    • Try
      • R(D);
      • Threat
        • S(G)
      • Vars
        • R(a);XR(D)::S(G),XR(a)
      • Refutation
        • R(c);N_SPINR(c),P_PINS(G),XQ(F)
    • Try
      • R(K);
      • Threat
        • S(G)
      • Vars
        • R(a);XR(K)::S(G),XR(a)
      • Refutation
        • R(c);N_SPINR(c),P_PINS(G),XQ(F)
    • Try
      • P(C);XR(c)
      • Threat
        • R1(D)
      • Vars
        • R(a);N_GUARD,XP(B)::S(G)
        • R(a);N_GUARD::S(G),XR(a)
      • Refutation
        • R(a);
  • Actual
    • Q(F);N_PINR(c),P_PINR(a),P_SPINS(G)
    • Vars
      • R(c);CHECK,OGATE,XS(G)::R(D),XR(c)
      • R(c);N_PINS(G),XP(B)::S(G)
      • R(c);N_PINS(G),XP(I)::S(G)
      • R(c);N_PINS(G),N_SPINR(a),OGATE::P(A),XR(c)
      • R(c);OGATEB::R(K),XR(c)
      • R(c);N_GUARD::QAB(F),XR(a)
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