MESON Chess Problem Database

Problem Display
PID: 142891 (RbkN4/8/1n2R3/B4P2/B6Q/8/3K4/8 w - - 0 1)

Stal, Karl Alfred

British Chess Magazine, 1892

RbkN4/8/1n2R3/B4P2/B6Q/8/3K4/8

#2

8 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4+
      • 2.Qxc4#
    • 1...Sd7
      • 2.Rc6#
  • Tries
    • 1.Rxb8+?
      • 1...Kc7
        • 2.Qg3#
        • 2.Qh2#
        • 2.Qf4#
      • 1...Kxb8!
    • 1.Qe7?
      • threat
        • 2.Rc6#
      • 1...Sxa8
        • 2.Bd7#
        • 2.Qb7#
        • 2.Qd7#
      • 1...Sd5
        • 2.Bd7#
        • 2.Qb7#
        • 2.Qd7#
      • 1...Sc4+!
    • 1.Qc4+?
      • 1...Kxd8
        • 2.Bxb6#
        • 2.Re8#
        • 2.Rxb8#
      • 1...Sxc4+!
    • 1.Qd4?
      • threat
        • 2.Rc6#
      • 1...Sc4+
        • 2.Qxc4#
      • 1...Kc7
        • 2.Rc6#
        • 2.Qd7#
      • 1...Sxa8
        • 2.Bd7#
        • 2.Qd7#
      • 1...Sd5!
    • 1.Qf4?
      • threat
        • 2.Rxb8#
        • 2.Qxb8#
      • 1...Sc4+
        • 2.Qxc4#
      • 1...Kxd8
        • 2.Re8#
        • 2.Rxb8#
        • 2.Qxb8#
      • 1...Sxa4
        • 2.Qc7#
      • 1...Sd7
        • 2.Rc6#
        • 2.Qc7#
      • 1...Sxa8!
    • 1.Qh7?
      • 1...Kxd8
        • 2.Re8#
        • 2.Rxb8#
        • 2.Qd7#
      • 1...Sxa4
        • 2.Rc6#
        • 2.Qb7#
        • 2.Qc7#
      • 1...Sxa8
        • 2.Bd7#
        • 2.Qb7#
        • 2.Qd7#
      • 1...Sd5
        • 2.Bd7#
        • 2.Qb7#
        • 2.Qd7#
      • 1...Sd7
        • 2.Bxd7#
        • 2.Rc6#
        • 2.Qxd7#
      • 1...Sc4+!
  • Keys
    • 1.Re7!
      • 1...Sc4+
        • 2.Qxc4#
      • 1...Kxd8
        • 2.Rxb8#
      • 1...Sxa4
        • 2.Rc7#
      • 1...Sxa8
        • 2.Bd7#
      • 1...Sd5
        • 2.Bd7#
      • 1...Sd7
        • 2.Bxd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);CHECK,N_GUARD::QAR(C),XS(a)
    • S(a);SBLOCK::R(F)
  • Tries
    • Try
      • R(G);CHECK,XB(b)
      • Refutation
        • K(c);P-FLIGHT,XR(G)
    • Try
      • Q(C);
      • Threat
        • R(F)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(C);CHECK
      • Refutation
        • S(a);CHECK,XQ(C)
    • Try
      • Q(C);
      • Threat
        • R(F)
      • Vars
        • S(a);CHECK,N_GUARD::QAR(C),XS(a)
      • Refutation
        • S(a);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);CHECK,N_GUARD::QAR(C),XS(a)
        • S(a);XB(B)::QAR1(C)
      • Refutation
        • S(a);N_SPINB(b),XR(G)
    • Try
      • Q(C);
      • Refutation
        • S(a);CHECK
  • Actual
    • R(F);
    • Vars
      • S(a);CHECK,N_GUARD::QAR(C),XS(a)
      • K(c);P-FLIGHT,P_SPINS(a),XS(H)::R(G),XB(b)
      • S(a);XB(B)::R1(F)
      • S(a);N_GUARD,N_SPINB(b),XR(G)::B(B)
      • S(a);N_GUARD::B(B)
      • S(a);N_GUARD::B(B),XS(a)
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