MESON Chess Problem Database

Problem Display
PID: 122372 (B1rr1R2/Q3p1q1/2n5/3n4/4kB2/4p3/4N1p1/4N1K1 w - - 0 1)

Melders, Visvaldis

Riga Central CC, 1949

B1rr1R2/Q3p1q1/2n5/3n4/4kB2/4p3/4N1p1/4N1K1

#2

7 + 9

113 Shakhmaty v SSSR 1949
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sg3#
    • 1...Qb2
      • 2.Sg3#
    • 1...Qc3
      • 2.Sg3#
    • 1...Qd4
      • 2.Sg3#
    • 1...Qe5
      • 2.Sg3#
    • 1...Qh6
      • 2.Sg3#
    • 1...Qh8
      • 2.Sg3#
    • 1...Qg3
      • 2.Sxg3#
    • 1...Qh7
      • 2.Sg3#
    • 1...Sb4
      • 2.Qxe3#
    • 1...Sa5
      • 2.Qxe3#
    • 1...Se5
      • 2.Qxe3#
      • 2.Qd4#
    • 1...Sb8
      • 2.Qxe3#
  • Tries
    • 1.Qd4+?
      • 1...Qxd4
        • 2.Sg3#
      • 1...Sxd4!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qc2#
      • 1...Sxf4
        • 2.Rxf4#
        • 2.Qf5#
      • 1...Qb2
        • 2.Sg3#
      • 1...Qc3
        • 2.Sg3#
      • 1...Qd4
        • 2.Sg3#
      • 1...Sc3
        • 2.Qf5#
      • 1...Sdb4
        • 2.Qf5#
      • 1...Sb6
        • 2.Qf5#
      • 1...Sf6
        • 2.Qe5#
      • 1...Sc7
        • 2.Qf5#
      • 1...Scb4
        • 2.Qxe3#
      • 1...Sd4
        • 2.Sc3#
      • 1...Sa5
        • 2.Qxe3#
      • 1...Se5
        • 2.Sc3#
        • 2.Qxe3#
        • 2.Qd4#
      • 1...Sa7
        • 2.Qxe3#
      • 1...Sb8
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 6
  • Sets
    • Q(g);N_GUARD,P_PINS(A)::S(C)
    • Q(g);N_GUARD::S(C)
    • Q(g);N_GUARD::S(C),XQ(g)
    • S(e);P_SPINS(d)::QAR1(E),XP(b)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • Q(g);SBLOCK,XQ(E)::S(C)
      • Refutation
        • S(e);P_SPINS(d),XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAB(E)
    • Vars
      • Q(g);N_GUARD::S(C)
      • S(d);OGATE,P_SPINS(e)::QAB1(E)
      • S(d);OGATE,P_SPINS(e)::QAR1(E)
      • S(e);P_SPINS(d)::QAR1(E),XP(b)
      • S(e);P_SPINS(d),S_CUTQ(g)::S(C)
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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).