MESON Chess Problem Database

Problem Display
PID: 223095 (8/8/3p4/2NkN1Q1/3p4/3K4/8/8 w - - 0 1)

Phelps, Francis Bradley

San Francisco Argonaut, 1885

8/8/3p4/2NkN1Q1/3p4/3K4/8/8

#2

4 + 3

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Sa6?
      • 1...Ke6
        • 2.Sc7#
      • 1...dxe5!
    • 1.Qg2+?
      • 1...Kxe5
        • 2.Qg5#
      • 1...Kxc5!
    • 1.Qg8+?
      • 1...Kxe5
        • 2.Qg5#
      • 1...Kxc5!
  • Keys
    • 1.Qd8!
      • 1...Kxc5
        • 2.Qa5#
      • 1...Kxe5
        • 2.Qg5#

This anticipates 107897(1897), 255115(1932), 77518(1984)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);
      • Vars
        • K(b);S_FLIGHT::S(B)
      • Refutation
        • P(c);P_SPINP(c),XS(C)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);OGATEB,P-FLIGHT,XS(C)::QAR2(D)
      • Refutation
        • K(b);P-FLIGHT,XS(B)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);OGATEB,P-FLIGHT,XS(C)::QAR2(D)
      • Refutation
        • K(b);P-FLIGHT,XS(B)
  • Actual
    • Q(D);P_PINP(c)
    • Vars
      • K(b);N_SPINP(c),OGATEB,P-FLIGHT,XS(B)::QAR2(D)
      • K(b);N_SPINP(c),OGATEB,P-FLIGHT,XS(C)::QAR2(D)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).