MESON Chess Problem Database

Problem Display
PID: 46731 (8/4p3/N1P1pR2/4k3/8/4K3/5QR1/8 w - - 0 1)

Loyd, Sam

Chicago Times, 1879

8/4p3/N1P1pR2/4k3/8/4K3/5QR1/8

#2

6 + 3

5206 Sam Loyd and His Chess Problems 1913

SOLUTION

  • SOUND
  • Tries
    • 1.Kd3?
      • threat
        • 2.Qd4#
      • 1...Kd5
        • 2.Qc5#
      • 1...Kd6
        • 2.Qc5#
      • 1...exf6!
    • 1.Sc7?
      • threat
        • 2.Rxe6#
        • 2.Qf4#
      • 1...exf6
        • 2.Qf4#
      • 1...Kd6!
    • 1.Rxe6+?
      • 1...Kd5
        • 2.Qa2#
      • 1...Kxe6!
    • 1.Qg3+?
      • 1...Kxf6
        • 2.Rf2#
        • 2.Qf4#
      • 1...Kd5!
    • 1.Qc2?
      • 1...Kd5
        • 2.Qc5#
      • 1...Kd6
        • 2.Qc5#
      • 1...exf6
        • 2.Qc5#
      • 1...Kxf6!
    • 1.Qf5+?
      • 1...Kd6
        • 2.Rxe6#
        • 2.Qxe6#
        • 2.Qc5#
      • 1...exf5!
  • Keys
    • 1.Kf3!
      • 1...Kd5
        • 2.Qc5#
      • 1...Kd6
        • 2.Qc5#
      • 1...Kxf6
        • 2.Ke4#
      • 1...exf6
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • QAB1(A)
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
        • K(a);P_SPINP(b),S_FLIGHT::QAB1(A)
      • Refutation
        • P(c);XR(F)
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);XR(F)::QAB1(A)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT
    • Try
      • R(F);CHECK,XP(b)
      • Vars
        • K(a);P-FLIGHT::QAB(A)
      • Refutation
        • K(a);P-FLIGHT,XR(F)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
        • K(a);P_SPINP(b),S_FLIGHT::QAB1(A)
        • P(c);SBLOCK,XR(F)::QAR2(A)
      • Refutation
        • K(a);S_FLIGHT,XR(F)
    • Try
      • Q(A);CHECK
      • Refutation
        • P(b);XQ(A)
  • Actual
    • K(C);P-FLIGHT
    • Vars
      • K(a);P-FLIGHT::QAR1(A)
      • K(a);P_SPINP(b),S_FLIGHT::QAB1(A)
      • K(a);S_FLIGHT,XR(F)::QAR(A)+K(C)
      • P(c);SBLOCK,XR(F)::QAR2(A)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).