MESON Chess Problem Database

Problem Display
PID: 96688 (2Q1BN2/q1nN3K/1p2Pp2/1p1k1p2/1B6/1P2PP1p/8/3r4 w - - 0 1)

Santiago, Joao Baptista

Problem (Zagreb), 1952

2Q1BN2/q1nN3K/1p2Pp2/1p1k1p2/1B6/1P2PP1p/8/3r4

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Qb7#
    • 1...Qa2
      • 2.Qb7#
    • 1...Qa3
      • 2.Qb7#
    • 1...Qa4
      • 2.Qb7#
    • 1...Qa5
      • 2.Qb7#
    • 1...Qb7
      • 2.Qxb7#
  • Tries
    • 1.Sxb6+?
      • 1...Ke5
        • 2.Sg6#
      • 1...Qxb6!
    • 1.Qxc7?
      • threat
        • 2.Sxf6#
        • 2.Qd6#
      • 1...Qb8
        • 2.Sxf6#
      • 1...Qa1
        • 2.Sxb6#
        • 2.Qd6#
        • 2.Qb7#
      • 1...Qxc7!
  • Keys
    • 1.Sg6!
      • threat
        • 2.Sxf6#
      • 1...Kc6
        • 2.Se7#
      • 1...Kxe6
        • 2.Sf4#
      • 1...Sxe6
        • 2.Se7#
      • 1...Sxe8
        • 2.Sf4#
      • 1...Qa1
        • 2.Sxb6#
      • 1...Sa6
        • 2.Sf4#
      • 1...Sa8
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(h);N_GUARD::QAB(H)
    • Q(h);N_GUARD::QAB(H),XQ(h)
  • Tries
    • Try
      • S(F);CHECK,XP(f)
      • Vars
        • K(d);P-FLIGHT::S(J)
      • Refutation
        • Q(h);XS(F)
    • Try
      • Q(H);XS(i)
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);::S(F),XP(g)
      • Refutation
        • Q(h);P_PINS(F),XQ(H)
  • Actual
    • S(J);
    • Threat
      • S(F),XP(g)
    • Vars
      • K(d);P_SPINS(i),S_FLIGHT::S(J)
      • K(d);S_FLIGHT,XP(E)::S(J)
      • S(i);P_PINS(F),SBLOCK,XP(E)::S(J)
      • S(i);P_PINS(F),XB(I)::S(J)
      • Q(h);N_GUARD::S(F),XP(f)
      • S(i);P_PINS(F)::S(J)
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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).