MESON Chess Problem Database

Problem Display
PID: 198247 (5K2/5Q1p/3p4/2p4r/2pkn1N1/R5p1/2PN1r1q/2R1n1BB w - - 0 1)

Langstaff, William A

6th HM., Club Argentino de Ajedrez, 1920

5K2/5Q1p/3p4/2p4r/2pkn1N1/R5p1/2PN1r1q/2R1n1BB

#2

9 + 11

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc2
      • 2.Sf3#
    • 1...Sg2
      • 2.Sf3#
    • 1...Sd3
      • 2.Sf3#
    • 1...Sf3
      • 2.Sxf3#
      • 2.Qxc4#
    • 1...Sg5
      • 2.Qf6#
    • 1...Sf6
      • 2.Qxc4#
    • 1...c3
      • 2.Sb3#
  • Tries
    • 1.Bxf2+?
      • 1...Sxf2
        • 2.Qxc4#
      • 1...gxf2
        • 2.Qxc4#
      • 1...Qxf2!
  • Keys
    • 1.Rd1!
      • threat
        • 2.Sf3#
      • 1...Sxd2
        • 2.Qf4#
      • 1...Sf3
        • 2.Sxf3#
        • 2.Qxc4#
      • 1...Sc3
        • 2.Sb3#
      • 1...Sg5
        • 2.Qf6#
      • 1...Sf6
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(a);N_GUARD,XP(D)::S(E)
    • S(a);N_GUARD::S(E)
    • S(g);N_GUARD,S_CUTR(i)::QAB(H)
    • S(g);N_PINQ(H)::QAR1(H),XP(e)
    • P(e);N_GUARD,SBLOCK::S(E)
  • Tries
    • Try
      • B(B);CHECK,N_SPINQ(H),XR(b)
      • Vars
        • S(g);XB(B)::QAR1(H),XP(e)
        • P(d);XB(B)::QAR1(H),XP(e)
      • Refutation
        • Q(c);P_PINQ(H),XB(B)
  • Actual
    • R(A);
    • Threat
      • R(A)+S(E),DCHECK
    • Vars
      • S(g);P_SPINS(g),XS(E)::QAR2(H)
      • S(g);SBLOCK::R(A)+S(E),DCHECK
      • S(g);N_GUARD,S_CUTR(i)::QAB(H)
      • S(g);N_PINQ(H)::QAR1(H),XP(e)
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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).