MESON Chess Problem Database

Problem Display
PID: 154026 (8/8/8/8/5p2/5K2/3N3p/4R1rk w - - 0 1)

Lawton, Howard

Sheffield Guardian (The), 1909

(First published on Fri Feb 26 1909)

8/8/8/8/5p2/5K2/3N3p/4R1rk

#2

3 + 4

15239 Valois Notebooks 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1+
      • 2.Rxf1#
  • Tries
    • 1.Sb1?
      • 1...Rf1+
        • 2.Rxf1#
      • 1...Rxe1!
    • 1.Sb3?
      • 1...Rf1+
        • 2.Rxf1#
      • 1...Rxe1!
    • 1.Sc4?
      • 1...Rf1+
        • 2.Rxf1#
      • 1...Rxe1!
    • 1.Se4?
      • threat
        • 2.Sf2#
      • 1...Rf1+
        • 2.Rxf1#
      • 1...Rxe1!
    • 1.Ra1?
      • 1...Rf1+
        • 2.Rxf1#
      • 1...Rb1
        • 2.Rxb1#
      • 1...Rc1
        • 2.Rxc1#
      • 1...Rd1
        • 2.Rxd1#
      • 1...Re1
        • 2.Rxe1#
      • 1...Rxa1!
    • 1.Rb1?
      • 1...Rf1+
        • 2.Rxf1#
      • 1...Rc1
        • 2.Rxc1#
      • 1...Rd1
        • 2.Rxd1#
      • 1...Re1
        • 2.Rxe1#
      • 1...Rxb1!
    • 1.Rc1?
      • 1...Rf1+
        • 2.Rxf1#
      • 1...Rd1
        • 2.Rxd1#
      • 1...Re1
        • 2.Rxe1#
      • 1...Rxc1!
    • 1.Rd1?
      • 1...Rf1+
        • 2.Rxf1#
      • 1...Re1
        • 2.Rxe1#
      • 1...Rxd1!
  • Keys
    • 1.Sf1!
      • 1...Rxf1+
        • 2.Rxf1#
      • 1...Rg3+
        • 2.Sxg3#
      • 1...Rg2
        • 2.Sg3#
      • 1...Rg4
        • 2.Sg3#
      • 1...Rg5
        • 2.Sg3#
      • 1...Rg6
        • 2.Sg3#
      • 1...Rg7
        • 2.Sg3#
      • 1...Rg8
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,OGATEB::R(A),XR(a)
  • Tries
    • Try
      • S(B);
      • Vars
        • R(a);CHECK,OGATEB::R(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XR(A)
    • Try
      • S(B);
      • Vars
        • R(a);CHECK,OGATEB::R(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XR(A)
    • Try
      • S(B);
      • Vars
        • R(a);CHECK,OGATEB::R(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XR(A)
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • R(a);CHECK,OGATEB::R(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XR(A)
    • Try
      • R(A);
      • Vars
        • R(a);CHECK,OGATEB::R(A),XR(a)
        • R(a);OGATEB::R(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XR(A)
    • Try
      • R(A);
      • Vars
        • R(a);CHECK,OGATEB::R(A),XR(a)
        • R(a);OGATEB::R(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XR(A)
    • Try
      • R(A);
      • Vars
        • R(a);CHECK,OGATEB::R(A),XR(a)
        • R(a);OGATEB::R(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XR(A)
    • Try
      • R(A);
      • Vars
        • R(a);CHECK,OGATEB::R(A),XR(a)
        • R(a);OGATEB::R(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XR(A)
  • Actual
    • S(B);N_PINR(a)
    • Vars
      • R(a);CHECK,OGATE,P_SPINR(a),XS(B)::R(A),XR(a)
      • R(a);CHECK::R(A)+S(B),DCHECK,XR(a)
      • R(a);::R(A)+S(B),DCHECK
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