MESON Chess Problem Database

Problem Display
PID: 84827 (1q4B1/3p4/nQ6/p1p1Rp2/1p1k1p1R/3N2b1/3K1N2/8 w - - 0 1)

Petite, Efren

Problemaz, 2007

1q4B1/3p4/nQ6/p1p1Rp2/1p1k1p1R/3N2b1/3K1N2/8

#2

7 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Qxd6#
    • 1...Qa7
      • 2.Qd6#
    • 1...Qc8
      • 2.Qd6#
    • 1...Qd8
      • 2.Qd6#
    • 1...Qe8
      • 2.Qd6#
    • 1...Bxf2
      • 2.Rxf4#
    • 1...Sc7
      • 2.Qxc5#
  • Tries
    • 1.Rxc5?
      • threat
        • 2.Rc4#
      • 1...Qxg8
        • 2.Qf6#
      • 1...Sxc5
        • 2.Qxc5#
      • 1...d5!
    • 1.Qxa6?
      • threat
        • 2.Rd5#
        • 2.Qc4#
      • 1...Qxe5
        • 2.Qc4#
      • 1...Bxf2
        • 2.Rxf4#
        • 2.Qc4#
      • 1...Qd6
        • 2.Qc4#
        • 2.Qxd6#
      • 1...Qb5
        • 2.Qd6#
      • 1...Qb7
        • 2.Qc4#
      • 1...Qa8
        • 2.Qc4#
      • 1...c4
        • 2.Rd5#
        • 2.Qxc4#
      • 1...d5
        • 2.Rxd5#
      • 1...Qxg8!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Re4#
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Qxg8
        • 2.Rxc5#
      • 1...Bxf2
        • 2.Rxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(j);N_GUARD::QAR2(F),XQ(j)
    • Q(j);N_GUARD::QAR2(F)
    • B(a);N_GUARD,XS(B)::R(D),XP(d)
    • S(h);N_GUARD::QAB1(F),XP(f)
  • Tries
    • Try
      • R(E);XP(f)
      • Threat
        • QAB(F)+R(E),DCHECK
      • Vars
        • Q(j);N_GUARD,XB(G)::QAB(F)
        • S(h);OGATE,P_SPINS(h),XR(E)::QAB1(F),XS(h)
      • Refutation
        • P(i);
    • Try
      • Q(F);XS(h)
      • Threat
        • DUALS(2)
      • Vars
        • Q(j);XR(E)::QAR1(F)
        • Q(j);N_GUARD::QAR2(F)
        • Q(j);::QAR1(F)
        • P(i);::R1(E),XP(i)
      • Refutation
        • Q(j);XB(G)
  • Actual
    • Q(F);
    • Threat
      • QAB(F)+R(E),DCHECK
    • Vars
      • Q(j);OGATE,P_SPINQ(j),XR(E)::QAB1(F),XQ(j)
      • Q(j);N_GUARD,XB(G)::QAB(F)+R(E),XP(f)
      • B(a);N_GUARD,XS(B)::R(D),XP(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).