MESON Chess Problem Database

Problem Display
PID: 214467 (1Kn1rqQ1/P2R1p2/b4p2/1pN2p2/3p1p2/P2P1P1k/1Pr1NRnP/8 w - - 0 1)

Seymour, Robert Hoe

American Chess Journal, 1877

1Kn1rqQ1/P2R1p2/b4p2/1pN2p2/3p1p2/P2P1P1k/1Pr1NRnP/8

#2

12 + 13

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxh2
      • 2.Qxg2#
    • 1...Sh4
      • 2.Sg1#
      • 2.Sxf4#
  • Tries
    • 1.Sg1+?
      • 1...Kxh2
        • 2.Qxg2#
      • 1...Kh4!
    • 1.Qh7+?
      • 1...Sh4
        • 2.Sg1#
        • 2.Sxf4#
      • 1...Qh6!
    • 1.Qg4+?
      • 1...Kxh2
        • 2.Qh5#
        • 2.Qxg2#
        • 2.Qh4#
      • 1...fxg4!
  • Keys
    • 1.Sxf4+!
      • 1...Kxh2
        • 2.Qxg2#
      • 1...Kh4
        • 2.Qg3#
      • 1...Sxf4
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT,P_SPINS(b),XP(D)::QAR1(L),XS(b)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINS(b),XP(D)::QAR1(L),XS(b)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(L);CHECK
      • Refutation
        • Q(m);P_SPINQ(m)
    • Try
      • Q(L);CHECK
      • Refutation
        • P(g);XQ(L)
  • Actual
    • S(B);CHECK,XP(e)
    • Vars
      • K(c);P-FLIGHT,P_SPINS(b),XP(D)::QAR1(L),XS(b)
      • K(c);P-FLIGHT::QAB1(L)
      • S(b);XS(B)::QAR1(L)
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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).