MESON Chess Problem Database

Problem Display
PID: 156245 (2b5/3p4/1R5B/3Rnp2/1PB5/b1k1P3/1npNK3/2Q5 w - - 0 1)

Petite, Efren

Best Problems, 2005

2b5/3p4/1R5B/3Rnp2/1PB5/b1k1P3/1npNK3/2Q5

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qxa3#
    • 1...Sbd3
      • 2.Qxa3#
    • 1...Sa4
      • 2.Qxa3#
  • Tries
    • 1.Bd3?
      • threat
        • 2.Qxc2#
      • 1...Sbxd3
        • 2.Qxa3#
      • 1...Sexd3!
    • 1.Bg7?
      • threat
        • 2.Bxe5#
      • 1...Sxc4
        • 2.Rd3#
      • 1...Sd3
        • 2.Rxd3#
        • 2.Qxa3#
      • 1...d6!
    • 1.Rd3+?
      • 1...Sbxd3
        • 2.Qxa3#
      • 1...Sexd3!
    • 1.Qa1?
      • threat
        • 2.Qxa3#
      • 1...c1S+
        • 2.Qxc1#
      • 1...Sxc4
        • 2.Rd3#
      • 1...c1Q
        • 2.Qxc1#
      • 1...c1B
        • 2.Qxc1#
      • 1...c1R
        • 2.Qxc1#
      • 1...Bxb4!
  • Keys
    • 1.Rc5!
      • threat
        • 2.Sb1#
      • 1...Sbxc4
        • 2.Qxa3#
      • 1...Sexc4
        • 2.Bg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(a);OGATE::QAR2(A),XB(c)
  • Tries
    • Try
      • B(F);
      • Threat
        • QAR1(A),XP(b)
      • Vars
        • S(a);OGATE,XB(F)::QAR2(A),XB(c)
      • Refutation
        • S(e);XB(F)
    • Try
      • B(I);P_PINS(e)
      • Threat
        • B(I),XS(e)
      • Vars
        • S(a);N_GUARD,XB(F)::R1(G)
      • Refutation
        • P(g);
    • Try
      • R(G);CHECK
      • Vars
        • S(a);OGATE,XR(G)::QAR2(A),XB(c)
      • Refutation
        • S(e);XR(G)
    • Try
      • Q(A);N_PINP(b),P_PINS(a)
      • Threat
        • QAR2(A),XB(c)
      • Vars
        • P(b);CHECK,OGATEB::QAR2(A),XS(b)
        • S(e);N_GUARD,XB(F)::R1(G)
        • P(b);OGATEB::QAR2(A),XQ(b)
        • P(b);OGATEB::QAR2(A),XB(b)
        • P(b);OGATEB::QAR2(A),XR(b)
      • Refutation
        • B(c);XP(E)
  • Actual
    • R(G);
    • Threat
      • S(B)
    • Vars
      • S(a);OGATE,P_SPINS(a),XB(F)::QAR2(A),XB(c)
      • S(e);OGATEB,P_SPINS(e),XB(F)::B(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).