MESON Chess Problem Database

Problem Display
PID: 125418 (8/8/8/k1K5/8/8/5Q1R/3b4 w - - 0 1)

Anonymous

Source?, 0000

8/8/8/k1K5/8/8/5Q1R/3b4

#2

3 + 2

3713 Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Qa2#
    • 1...Bf3
      • 2.Qa2#
    • 1...Bg4
      • 2.Qa2#
    • 1...Bh5
      • 2.Qa2#
  • Tries
    • 1.Qe1+?
      • 1...Ka4
        • 2.Qb4#
      • 1...Ka6!
    • 1.Qb2?
      • threat
        • 2.Qb5#
      • 1...Ka4
        • 2.Qa2#
        • 2.Qb4#
      • 1...Ka6
        • 2.Qb6#
      • 1...Be2
        • 2.Qa1#
        • 2.Qa3#
        • 2.Qa2#
      • 1...Ba4
        • 2.Qb6#
      • 1...Bb3!
    • 1.Qd2+?
      • 1...Ka4
        • 2.Qb4#
        • 2.Qa2#
      • 1...Ka6!
    • 1.Qg2?
      • threat
        • 2.Qa8#
      • 1...Ka4
        • 2.Qa2#
      • 1...Ka6
        • 2.Qa8#
      • 1...Bf3
        • 2.Qa2#
      • 1...Be2!
    • 1.Qf7?
      • threat
        • 2.Qa7#
      • 1...Ka4
        • 2.Ra2#
        • 2.Qa2#
      • 1...Be2
        • 2.Qa2#
      • 1...Ka6!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qa8#
      • 1...Ka4
        • 2.Ra2#
      • 1...Ka6
        • 2.Qa8#
      • 1...Bxf3
        • 2.Ra2#
      • 1...Be2
        • 2.Qa3#

This anticipates 10621(1966)

FEATURES

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