MESON Chess Problem Database

Problem Display
PID: 114898 (3N4/1R1p4/k7/1b6/2p5/1p6/n1N3Q1/R6K w - - 0 1)

Authier, Gabriel

BCF, 1951

3N4/1R1p4/k7/1b6/2p5/1p6/n1N3Q1/R6K

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Rxa2+?
      • 1...Ba4
        • 2.Rxa4#
      • 1...bxa2!
    • 1.Qd5?
      • threat
        • 2.Qxb5#
      • 1...Ka5
        • 2.Qxb5#
      • 1...Bc6
        • 2.Sb4#
      • 1...Ba4!
  • Keys
    • 1.Ra7+!
      • 1...Kb6
        • 2.Qg1#
        • 2.Qf2#
      • 1...Kxa7
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(A);CHECK,XS(a)
      • Vars
        • B(d);N_GUARD,P_SPINB(d)::R(A),XB(d)
      • Refutation
        • P(b);XR(A)
    • Try
      • Q(D);
      • Threat
        • QAB1(D),XB(d)
      • Vars
        • K(e);P-FLIGHT,P_SPINB(d)::QAR1(D),XB(d)
        • B(d);P_PINQ(D)::S(C)
      • Refutation
        • B(d);N_SPINS(a)
  • Actual
    • R(E);CHECK
    • Vars
      • K(e);P-FLIGHT,XR(E)::QAR1(D)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).