MESON Chess Problem Database

Problem Display
PID: 60019 (3N4/2p3B1/5NQ1/2k5/Rn3P2/8/4K3/8 w - - 0 1)

Loyd, Sam

American Chess Journal, 1877

3N4/2p3B1/5NQ1/2k5/Rn3P2/8/4K3/8

#2

7 + 3

5206 Sam Loyd and His Chess Problems 1913

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Bf8#
  • Tries
    • 1.Sd7+?
      • 1...Kc4
        • 2.Qd3#
      • 1...Kd5
        • 2.Qe6#
      • 1...Kb5!
    • 1.Rxb4?
      • threat
        • 2.Bf8#
      • 1...Kd6
        • 2.Bf8#
      • 1...Kxb4!
    • 1.Qe4?
      • threat
        • 2.Qxb4#
      • 1...Kb5
        • 2.Qxb4#
      • 1...Kb6
        • 2.Qxb4#
      • 1...Kd6
        • 2.Sb7#
        • 2.Bf8#
        • 2.Qe5#
      • 1...Sa2
        • 2.Qc6#
      • 1...Sc2
        • 2.Qc6#
      • 1...Sd3
        • 2.Qc6#
      • 1...Sa6
        • 2.Qc6#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sd5!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qxb4#
      • 1...Kc4
        • 2.Qxb4#
      • 1...Kd4
        • 2.Qxb4#
      • 1...Kb5
        • 2.Qxb4#
      • 1...Kb6
        • 2.Qxb4#
      • 1...Kd6
        • 2.Bf8#
      • 1...Sa2
        • 2.Bf8#
      • 1...Sc2
        • 2.Bf8#
      • 1...Sd3
        • 2.Bf8#
      • 1...Sd5
        • 2.Se4#
      • 1...Sa6
        • 2.Bf8#
      • 1...Sc6
        • 2.Sb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::B(F)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINS(a)::QAB1(E)
        • K(b);P-FLIGHT::QAB1(E)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(B);XS(a)
      • Threat
        • B(F)
      • Vars
        • K(b);S_FLIGHT::B(F)
      • Refutation
        • K(b);S_FLIGHT,XR(B)
    • Try
      • Q(E);
      • Threat
        • QAB1(E),XS(a)
      • Vars
        • K(b);P-FLIGHT::QAR1(E),XS(a)
        • K(b);S_FLIGHT::QAR2(E),XS(a)
        • S(a);N_GUARD::QAR1(E)
        • S(a);N_GUARD::QAR1(E),XS(a)
      • Refutation
        • S(a);
  • Actual
    • Q(E);
    • Threat
      • QAB1(E),XS(a)
    • Vars
      • K(b);P-FLIGHT,P_SPINS(a)::QAR1(E),XS(a)
      • K(b);P_SPINS(a),S_FLIGHT::QAR2(E),XS(a)
      • K(b);S_FLIGHT::B(F)
      • S(a);::B(F)
      • S(a);SBLOCK::S(D)
      • S(a);SBLOCK::S(G)
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