MESON Chess Problem Database

Problem Display
PID: 149495 (kB1K4/pp1N4/n7/4Q3/8/8/8/8 w - - 0 1)

Dawson, Thomas Rayner

Pittsburgh Sun, 1921

(First published on Sat May 7 1921)

kB1K4/pp1N4/n7/4Q3/8/8/8/8

#2

4 + 4

15256 TRD Scrapbook 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb8
      • 2.Qxb8#
    • 1...b5
      • 2.Qe4#
      • 2.Qd5#
    • 1...b6
      • 2.Qe4#
      • 2.Qd5#
  • Tries
    • 1.Qa5?
      • 1...Sxb8
        • 2.Sb6#
      • 1...b6
        • 2.Qd5#
      • 1...Sb4
        • 2.Qxa7#
      • 1...Sc5
        • 2.Qxa7#
      • 1...Sc7
        • 2.Qxa7#
      • 1...b5!
  • Keys
    • 1.Qa1!
      • 1...Sxb8
        • 2.Sb6#
      • 1...b5
        • 2.Qh1#
      • 1...b6
        • 2.Qh1#
      • 1...Sb4
        • 2.Qxa7#
      • 1...Sc5
        • 2.Qxa7#
      • 1...Sc7
        • 2.Qxa7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE,XB(C)::QAR1(A),XS(a)
  • Tries
    • Try
      • Q(A);
      • Vars
        • S(a);P_SPINP(b),SBLOCK,XB(C)::S(B)
        • P(c);OGATEB::QAB(A)
        • S(a);OGATE,P_SPINP(b)::QAR1(A),XP(b)
      • Refutation
        • P(c);
  • Actual
    • Q(A);
    • Vars
      • S(a);P_SPINP(b),SBLOCK,XB(C)::S(B)
      • P(c);OGATEB::QAB(A)
      • S(a);OGATE,P_SPINP(b)::QAR1(A),XP(b)
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