MESON Chess Problem Database

Problem Display
PID: 149620 (k7/8/2NN4/8/8/8/1K5n/5n1R w - - 0 1)

Dawson, Thomas Rayner

Pittsburgh Sun, 1922

(First published on Sat Feb 18 1922)

k7/8/2NN4/8/8/8/1K5n/5n1R

#2

4 + 3

5454 Near Snap 2014
15256 TRD Scrapbook 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Ra1#
    • 1...Se3
      • 2.Ra1#
    • 1...Sg3
      • 2.Ra1#
    • 1...Sf3
      • 2.Rh8#
    • 1...Sg4
      • 2.Rh8#
  • Tries
    • 1.Kc2?
      • 1...Sd2
        • 2.Ra1#
      • 1...Sg3
        • 2.Ra1#
      • 1...Sf3
        • 2.Rh8#
      • 1...Sg4
        • 2.Rh8#
      • 1...Se3+!
    • 1.Kb3?
      • 1...Se3
        • 2.Ra1#
      • 1...Sg3
        • 2.Ra1#
      • 1...Sf3
        • 2.Rh8#
      • 1...Sg4
        • 2.Rh8#
      • 1...Sd2+!
    • 1.Rxf1?
      • threat
        • 2.Ra1#
        • 2.Rf8#
      • 1...Sf3
        • 2.Ra1#
      • 1...Sxf1!
    • 1.Rg1?
      • threat
        • 2.Rg8#
      • 1...Sg3
        • 2.Ra1#
      • 1...Sg4!
  • Keys
    • 1.Kc3!
      • 1...Se3
        • 2.Ra1#
      • 1...Sd2
        • 2.Ra1#
      • 1...Sg3
        • 2.Ra1#
      • 1...Sf3
        • 2.Rh8#
      • 1...Sg4
        • 2.Rh8#

This anticipates 17646(1948), 87695(1990)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE::R(A)
    • S(b);OGATE::R(A)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(a);OGATE::R(A)
        • S(b);OGATE::R(A)
      • Refutation
        • S(a);CHECK
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(a);OGATE::R(A)
        • S(b);OGATE::R(A)
      • Refutation
        • S(a);CHECK
    • Try
      • R(A);XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::R(A)
      • Refutation
        • S(b);XR(A)
    • Try
      • R(A);
      • Threat
        • R(A)
      • Vars
        • S(a);OGATE::R(A)
      • Refutation
        • S(b);
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • S(a);OGATE::R(A)
      • S(b);OGATE::R(A)
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