MESON Chess Problem Database

Problem Display
PID: 17754 (8/8/2B5/8/5K2/7p/Q4B1k/5r2 w - - 0 1)

Hartong, Jan

Jaarboek, 1949

8/8/2B5/8/5K2/7p/Q4B1k/5r2

#2

4 + 3

3295 Einfuhrung in die Welt des Schachproblem 1984
5309 O Mosqueteiro do Rei 1997
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Bg3#
    • 1...Rh1
      • 2.Be3#
      • 2.Bd4#
      • 2.Bc5#
      • 2.Bb6#
      • 2.Ba7#
    • 1...Rxf2+
      • 2.Qxf2#
  • Tries
    • 1.Qg8?
      • threat
        • 2.Qg3#
      • 1...Rg1
        • 2.Bxg1#
        • 2.Qxg1#
      • 1...Rxf2+!
    • 1.Qe2?
      • 1...Rxf2+
        • 2.Qxf2#
      • 1...Ra1
        • 2.Be3#
        • 2.Bd4#
        • 2.Bc5#
        • 2.Bb6#
        • 2.Ba7#
      • 1...Rb1
        • 2.Be3#
        • 2.Bd4#
        • 2.Bc5#
        • 2.Bb6#
        • 2.Ba7#
      • 1...Rc1
        • 2.Be3#
        • 2.Bd4#
        • 2.Bc5#
        • 2.Bb6#
        • 2.Ba7#
      • 1...Rd1
        • 2.Be3#
        • 2.Bd4#
        • 2.Bc5#
        • 2.Bb6#
        • 2.Ba7#
      • 1...Rg1
        • 2.Bg3#
      • 1...Rh1
        • 2.Be3#
        • 2.Bd4#
        • 2.Bc5#
        • 2.Bb6#
        • 2.Ba7#
      • 1...Re1!
  • Keys
    • 1.Qa7!
      • 1...Rxf2+
        • 2.Qxf2#
      • 1...Ra1
        • 2.Bg3#
      • 1...Rb1
        • 2.Bg3#
      • 1...Rc1
        • 2.Bg3#
      • 1...Rd1
        • 2.Bg3#
      • 1...Re1
        • 2.Bg3#
      • 1...Rg1
        • 2.Bxg1#
      • 1...Rh1
        • 2.Bg3#

This anticipates 18491(1956)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(a);N_PINB(B),SBLOCK::QAR(A)+B(B),DCHECK
    • R(a);CHECK,OGATE,P_SPINR(a),XB(B)::QAR2(A),XR(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Refutation
        • R(a);CHECK,XB(B)
    • Try
      • Q(A);
      • Vars
        • R(a);CHECK,OGATE,P_SPINR(a),XB(B)::QAR2(A),XR(a)
        • R(a);N_PINB(B),SBLOCK::QAR(A)+B(B),DCHECK
      • Refutation
        • R(a);N_PINB(B)
  • Actual
    • Q(A);
    • Vars
      • R(a);CHECK,OGATE,XB(B)::QAR2(A),XR(a)
      • R(a);N_PINB(B)::B(B)
      • R(a);N_PINB(B)::B(B),XR(a)
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