MESON Chess Problem Database

Problem Display
PID: 76814 (4Q3/2qp4/p2B4/2R1P3/1k6/1P6/1K6/8 w - - 0 1)

Butwillo, Brother

The Tablet, 1946

(First published on Sat Jan 26 1946)

4Q3/2qp4/p2B4/2R1P3/1k6/1P6/1K6/8

#2

6 + 4

15239 Valois Notebooks 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qb8
      • 2.Qxb8#
    • 1...Qd8
      • 2.Rd5#
    • 1...Qb7
      • 2.Rd5#
  • Tries
    • 1.Qf7?
      • threat
        • 2.Qc4#
        • 2.Qf4#
      • 1...Qxd6
        • 2.Qc4#
      • 1...Qc6
        • 2.Qc4#
      • 1...Qb7
        • 2.Rd5#
        • 2.Qc4#
      • 1...Qxc5!
    • 1.Qb8+?
      • 1...Qb6
        • 2.Rd5#
        • 2.Qxb6#
      • 1...Qb7
        • 2.Rd5#
        • 2.Qxb7#
      • 1...Qxb8!
    • 1.Qg8?
      • threat
        • 2.Qc4#
        • 2.Qg4#
      • 1...Qxd6
        • 2.Qc4#
      • 1...Qc6
        • 2.Qc4#
      • 1...Qb7
        • 2.Rd5#
        • 2.Qc4#
      • 1...Qxc5!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qh4#
      • 1...Qxd6
        • 2.Qa5#
      • 1...Qxd8
        • 2.Rd5#
      • 1...Qxc5
        • 2.Qb6#
      • 1...Qc6
        • 2.Qa5#
      • 1...Qb7
        • 2.Ra5#
        • 2.Rd5#
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_GUARD::QAR(F),XQ(c)
    • Q(c);N_GUARD::B(E)+R(C)
  • Tries
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XB(E)::QAR1(F)
        • Q(c);::QAR1(F)
      • Refutation
        • Q(c);P_SPINQ(c),XR(C)
    • Try
      • Q(F);CHECK
      • Refutation
        • Q(c);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XB(E)::QAR1(F)
        • Q(c);::QAR1(F)
      • Refutation
        • Q(c);P_SPINQ(c),XR(C)
  • Actual
    • Q(F);
    • Threat
      • QAR(F)
    • Vars
      • Q(c);OGATE,XB(E)::QAB1(F)
      • Q(c);N_GUARD,XQ(F)::B(E)+R(C)
      • Q(c);OGATE,P_SPINQ(c),XR(C)::QAR2(F)
      • Q(c);OGATE::QAB1(F)
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