MESON Chess Problem Database

Problem Display
PID: 193546 (8/7Q/1N6/1R1pppPK/2pB1k2/2n2B1R/3nr3/4N3 w - - 0 1)

Todd, William R

1st Prize, Four-Leaved Shamrock, 1915

8/7Q/1N6/1R1pppPK/2pB1k2/2n2B1R/3nr3/4N3

#2

9 + 8

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rg2
      • 2.Sxg2#
    • 1...Re3
      • 2.Sg2#
    • 1...Re4
      • 2.Sg2#
    • 1...Sb1
      • 2.Sxd5#
    • 1...Sd1
      • 2.Sxd5#
    • 1...Sa2
      • 2.Sxd5#
    • 1...Sa4
      • 2.Sxd5#
    • 1...Se4
      • 2.Sxd5#
    • 1...Sxb5
      • 2.Sxd5#
    • 1...e4
      • 2.Qc7#
  • Tries
    • 1.Be3+?
      • 1...Rxe3
        • 2.Sg2#
      • 1...Kxe3!
  • Keys
    • 1.Be4!
      • threat
        • 2.Qxf5#
      • 1...Kxe4
        • 2.Rh4#
      • 1...Rxe4
        • 2.Sg2#
      • 1...Sdxe4
        • 2.Rf3#
      • 1...Scxe4
        • 2.Sxd5#
      • 1...dxe4
        • 2.Bxe5#
      • 1...fxe4
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • R(b);N_GUARD::S(A),XR(b)
    • R(b);N_GUARD::S(A)
    • S(c);N_GUARD::S(H),XP(f)
    • S(c);N_GUARD,XR(E)::S(H),XP(f)
    • P(g);OGATEB::QAB(I)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • R(b);XB(D)::S(A)
      • Refutation
        • K(e);S_FLIGHT,XB(D)
  • Actual
    • B(B);
    • Threat
      • QAR1(I),XP(h)
    • Vars
      • K(e);P-FLIGHT,P_SPINP(h),XB(B)::R(C)
      • R(b);N_GUARD,SBLOCK,XB(B)::S(A)
      • S(a);N_GUARD,SBLOCK,XB(B)::R1(C)
      • S(c);N_GUARD,SBLOCK,XB(B)::S(H),XP(f)
      • P(f);SBLOCK,XB(B)::B(D),XP(g)
      • P(h);OGATEB,SBLOCK,XB(B)::QAR(I)
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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).