MESON Chess Problem Database

Problem Display
PID: 51031 (2r5/1n1N4/8/8/P1Bkp3/8/1K2Q3/8 w - - 0 1)

Williams, PS

The Inquirer, 1913

2r5/1n1N4/8/8/P1Bkp3/8/1K2Q3/8

#2

5 + 4

5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc4
      • 2.Qd2#
    • 1...e3
      • 2.Qd3#
      • 2.Qg4#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Qc3#
      • 1...Rxc4
        • 2.Qd2#
      • 1...e3
        • 2.Qd3#
      • 1...Ke3!
    • 1.Qf2+?
      • 1...e3
        • 2.Qh4#
        • 2.Qf4#
      • 1...Kxc4!
    • 1.Qe3+?
      • 1...Kxc4
        • 2.Qxe4#
      • 1...Kxe3!
  • Keys
    • 1.Qe1!
      • threat
        • 2.Qc3#
      • 1...Kxc4
        • 2.Qxe4#
      • 1...Rxc4
        • 2.Qd2#
      • 1...e3
        • 2.Qh4#

Anticipated by 224495(1887)

This anticipates 190141(1913), 121520(1948), 224811(2004)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(d);SBLOCK,XB(D)::QAR2(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • R(d);SBLOCK,XB(D)::QAR2(B)
        • P(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);P-FLIGHT,XB(D)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT,XB(D)::QAR2(B),XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(a);P-FLIGHT,XB(D)::QAR2(B),XP(b)
      • R(d);SBLOCK,XB(D)::QAR2(B)
      • P(b);OGATEB,SBLOCK::QAR(B)
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