MESON Chess Problem Database

Problem Display
PID: 87430 (6rB/b5rb/8/1QN5/p7/1Nkn3R/Pp4R1/3B1nK1 w - - 0 1)

Barron, Philip

American Chess Problemist, 1950

6rB/b5rb/8/1QN5/p7/1Nkn3R/Pp4R1/3B1nK1

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Bxg7#
    • 1...Rb8
      • 2.Bxg7#
    • 1...Rc8
      • 2.Bxg7#
    • 1...Bxc5+
      • 2.Qxc5#
    • 1...Bb8
      • 2.Sxa4#
    • 1...Bg6
      • 2.Rc2#
    • 1...Se3
      • 2.Sxa4#
    • 1...Sg3
      • 2.Rc2#
  • Tries
    • 1.Re3?
      • threat
        • 2.Sxa4#
      • 1...Bxc5
        • 2.Qxc5#
      • 1...a3
        • 2.Sa4#
      • 1...axb3!
  • Keys
    • 1.a3!
      • threat
        • 2.Qb4#
      • 1...Bxc5+
        • 2.Qxc5#
      • 1...Rb8
        • 2.Bxg7#
      • 1...Se3
        • 2.Sxa4#
      • 1...Sg3
        • 2.Rc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • R(i);N_GUARD::B(I),XR(g)
    • B(f);CHECK,OGATE,XS(H)::QAR2(G),XB(f)
    • B(f);N_PINS(H)::S(H),XP(e)
    • B(h);N_PINR(D)::R1(D)
    • S(a);N_PINS(H),N_SPINS(d)::S(H),XP(e)
    • S(a);N_PINR(D),N_SPINS(d)::R1(D)
  • Tries
    • Try
      • R(F);N_SPINS(H)
      • Threat
        • S(H),XP(e)
      • Vars
        • B(f);OGATE,XS(H)::QAR2(G),XB(f)
        • P(e);::S(H)
      • Refutation
        • P(e);XS(E)
  • Actual
    • P(C);
    • Threat
      • QAB1(G)
    • Vars
      • B(f);CHECK,OGATE,XS(H)::QAR2(G),XB(f)
      • R(i);N_GUARD::B(I),XR(g)
      • S(a);N_PINS(H),N_SPINS(d)::S(H),XP(e)
      • S(a);N_PINR(D),N_SPINS(d)::R1(D)
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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).