MESON Chess Problem Database

Problem Display
PID: 79677 (1Q6/3NB1p1/n2q4/P2p4/3k1P2/2p2K2/1NR5/8 w - - 0 1)

Shifrin, Semion

Variantim, 2007

1Q6/3NB1p1/n2q4/P2p4/3k1P2/2p2K2/1NR5/8

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Qe5#
    • 1...Qb4
      • 2.Qe5#
    • 1...Qxf4+
      • 2.Qxf4#
    • 1...Qc5
      • 2.Qe5#
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qb6
      • 2.Qe5#
    • 1...Qc6
      • 2.Qe5#
    • 1...Qg6
      • 2.Qe5#
    • 1...Qh6
      • 2.Qe5#
    • 1...Qxd7
      • 2.Qe5#
    • 1...Sc5
      • 2.Qb4#
  • Keys
    • 1.Sc5!
      • threat
        • 2.Sb3#
      • 1...Qxf4+
        • 2.Qxf4#
      • 1...Kxc5
        • 2.Qb6#
      • 1...Qxc5
        • 2.Qe5#
      • 1...Qxb8
        • 2.Se6#
      • 1...Sxc5
        • 2.Qb4#
      • 1...cxb2
        • 2.Qxb2#
      • 1...Qb6
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(e);OGATE::QAB1(H)
    • Q(e);CHECK,OGATE,XP(D)::QAR2(H),XQ(e)
    • Q(e);OGATE::QAB1(H),XQ(e)
    • Q(e);OGATE,XS(F)::QAB1(H)
    • S(d);N_GUARD,S_CUTQ(e)::QAR2(H)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • Q(e);CHECK,OGATE,XP(D)::QAR2(H),XQ(e)
      • K(b);OGATEB,P_SPINP(a),P_SPINQ(e),S_FLIGHT,XS(F)::QAB1(H)
      • Q(e);OGATE,XS(F)::QAB1(H)
      • Q(e);N_GUARD,XQ(H)::S(F)
      • S(d);N_GUARD,XS(F)::QAR2(H)
      • P(a);OGATE,XS(A)::QAB(H),XP(a)
      • Q(e);OGATE::QAB1(H)
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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).