MESON Chess Problem Database

Problem Display
PID: 4580 (8/4R3/8/8/1k6/R1NK4/8/5Q2 w - - 0 1)

Loyd, Sam

St. John Globe, 1880

8/4R3/8/8/1k6/R1NK4/8/5Q2

#2

5 + 1

5206 Sam Loyd and His Chess Problems 1913
785 Het Belgisch Schaakbord (L'Echiquier Belge) 1947
5454 Near Snap 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Ra1?
      • 1...Kb3
        • 2.Rb7#
        • 2.Qb1#
      • 1...Kc5!
    • 1.Ra2?
      • 1...Kb3
        • 2.Rb7#
        • 2.Qb1#
      • 1...Kc5!
    • 1.Ra4+?
      • 1...Kb3
        • 2.Rb7#
        • 2.Qb1#
      • 1...Kc5!
    • 1.Ra5?
      • 1...Kb3
        • 2.Rb7#
        • 2.Qb1#
      • 1...Kxa5!
    • 1.Ra6?
      • 1...Kb3
        • 2.Rb7#
        • 2.Qb1#
      • 1...Kc5!
    • 1.Raa7?
      • 1...Kb3
        • 2.Reb7#
        • 2.Qb1#
      • 1...Kc5!
    • 1.Ra8?
      • 1...Kb3
        • 2.Rb7#
        • 2.Qb1#
      • 1...Kc5!
    • 1.Re6?
      • threat
        • 2.Qf8#
      • 1...Kc5
        • 2.Qf8#
      • 1...Kxa3!
    • 1.Rb7+?
      • 1...Kxa3
        • 2.Qa1#
        • 2.Qc1#
        • 2.Qf8#
      • 1...Kc5!
    • 1.Qb1+?
      • 1...Kxa3
        • 2.Ra7#
      • 1...Kc5!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Re1#
        • 2.Re2#
        • 2.Re3#
        • 2.Re4#
        • 2.Re5#
        • 2.Re6#
        • 2.Rea7#
        • 2.Rb7#
        • 2.Rc7#
        • 2.Rd7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
        • 2.Re8#
      • 1...Kxa3
        • 2.Rb7#
      • 1...Kc5
        • 2.Re6#

This anticipates 81483(1994)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(B);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(B);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(B);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(B);
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • R(B);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(B);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(B);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(E);
      • Threat
        • QAB(A)
      • Vars
        • K(a);S_FLIGHT::QAB(A)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • R(E);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT,XR(B)::R(E)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • DUALS(14)
    • Vars
      • K(a);S_FLIGHT,XR(B)::QAB(A)+R(E)
      • K(a);S_FLIGHT::QAB(A)+R(E)
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