MESON Chess Problem Database

Problem Display
PID: 80640 (8/4B2B/4p3/4kpNR/1p1p1pR1/8/3QP1K1/8 w - - 0 1)

Welburn, T

The Field, 1947

(First published on Sat Oct 25 1947)

8/4B2B/4p3/4kpNR/1p1p1pR1/8/3QP1K1/8

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...b3
      • 2.Qa5#
    • 1...fxg4
      • 2.Sf3#
      • 2.Sh3#
      • 2.Se4#
      • 2.Sf7#
  • Tries
    • 1.Sf3+?
      • 1...Ke4
        • 2.Qxd4#
      • 1...Kd5!
    • 1.Qc1?
      • threat
        • 2.Qc5#
      • 1...Kd5
        • 2.Qc5#
      • 1...f3+!
    • 1.Qxb4?
      • threat
        • 2.Qa5#
        • 2.Qc5#
        • 2.Qd6#
        • 2.Qb5#
      • 1...Kd5
        • 2.Qc5#
        • 2.Qb5#
      • 1...d3
        • 2.Qc5#
        • 2.Qd6#
      • 1...f3+!
    • 1.Qa2?
      • threat
        • 2.Qxe6#
        • 2.Qa5#
      • 1...f3+
        • 2.Sxf3#
      • 1...b3
        • 2.Qa5#
      • 1...d3!
    • 1.Qc2?
      • threat
        • 2.Qc5#
      • 1...Kd5
        • 2.Qc5#
      • 1...f3+!
    • 1.Qd3?
      • threat
        • 2.Qb5#
      • 1...Kd5
        • 2.Qb5#
      • 1...f3+!
  • Keys
    • 1.e4!
      • threat
        • 2.Qxf4#
      • 1...f3+
        • 2.Sxf3#
      • 1...fxe4
        • 2.Sf3#
        • 2.Sh3#
        • 2.Sxe4#
        • 2.Sf7#
      • 1...fxg4
        • 2.Sf3#
        • 2.Sh3#
        • 2.Sf7#
      • 1...dxe4 ep
        • 2.Qd6#
      • 1...fxe4 ep
        • 2.Qxd4#
      • 1...d3
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(a);OGATE::QAR(A)
  • Tries
    • Try
      • S(E);CHECK,P_PINP(e)
      • Vars
        • K(d);N_SPINP(e),P-FLIGHT,P_SPINP(c)::QAR1(A),XP(b)
      • Refutation
        • K(d);N_SPINP(e),P-FLIGHT,P_SPINP(b)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(A);XP(a)
      • Threat
        • DUALS(4)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);CHECK::S(E),XP(c)
        • P(a);::QAR(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(d);P-FLIGHT,P_SPINP(b)::QAR2(A)
      • Refutation
        • P(c);CHECK
  • Actual
    • P(B);
    • Threat
      • QAB1(A),XP(c)
    • Vars
      • P(c);CHECK::S(E),XP(c)
      • P(b);EP,OGATE,XP(B)::QAB1(A)
      • P(c);EP,XP(B)::QAB1(A),XP(b)
      • P(b);OGATEB::QAB(A)
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