MESON Chess Problem Database

Problem Display
PID: 166678 (1r1q3b/8/1nN1Rn1r/3P2pp/BPkp2p1/8/b3P1N1/B3Q2K w - - 0 1)

Zappas, Byron

4th HM., BCPS-40 JT, 1958-1960

1r1q3b/8/1nN1Rn1r/3P2pp/BPkp2p1/8/b3P1N1/B3Q2K

#2

10 + 12

5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.Qc1#
    • 1...Sbxd5
      • 2.Se5#
    • 1...Sfxd5
      • 2.Sa5#
    • 1...d3
      • 2.Se3#
  • Tries
    • 1.Qc3+?
      • 1...dxc3
        • 2.Se3#
      • 1...Kxd5!
  • Keys
    • 1.Sxd4!
      • threat
        • 2.Se3#
      • 1...Kxd5
        • 2.Se3#
      • 1...Qxd5
        • 2.Qc3#
      • 1...Sbxd5
        • 2.Rc6#
      • 1...Sfxd5
        • 2.Bb5#

This anticipates 152605(1985)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(k);P_PINS(E),SBLOCK,XP(H)::QAR(B)
    • S(g);SBLOCK,XP(H)::S(I)
    • S(h);SBLOCK,XP(H)::S(I)
    • P(c);N_GUARD::S(E)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • P(c);XQ(B)::S(E)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
  • Actual
    • S(I);XP(c)
    • Threat
      • S(E)
    • Vars
      • K(b);S_FLIGHT,XP(H)::S(E)
      • Q(k);P_PINS(E),SBLOCK,XP(H)::QAR1(B)
      • S(g);SBLOCK,XP(H)::R(J)
      • S(h);SBLOCK,XP(H)::B(F)
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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).