MESON Chess Problem Database

Problem Display
PID: 45548 (8/4p3/Q3p3/4P3/N2kPp2/1P1P4/2rn1P2/bB1R2NK w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/4p3/Q3p3/4P3/N2kPp2/1P1P4/2rn1P2/bB1R2NK

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb1
      • 2.Sf3#
    • 1...Sf1
      • 2.Sf3#
    • 1...Sxb3
      • 2.Sf3#
    • 1...Sf3
      • 2.Sxf3#
    • 1...Sc4
      • 2.Sf3#
  • Tries
    • 1.Qb5?
      • threat
        • 2.Se2#
      • 1...Sxb1
        • 2.Sf3#
      • 1...Sxb3
        • 2.Sf3#
      • 1...Sxe4
        • 2.Sf3#
      • 1...Rc5
        • 2.Qxc5#
      • 1...Sf1
        • 2.Sf3#
      • 1...Sf3
        • 2.Sxf3#
      • 1...Sc4
        • 2.Sf3#
        • 2.Qc5#
      • 1...f3!
  • Keys
    • 1.Qxe6!
      • threat
        • 2.Qd5#
      • 1...Kxd3
        • 2.Qc4#
      • 1...Sxe4
        • 2.Sf3#
      • 1...Rc5
        • 2.Se2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(c);N_GUARD,XB(A)::S(C)
    • S(c);N_GUARD::S(C)
    • S(c);N_GUARD,XP(F)::S(C)
    • S(c);N_GUARD::S(C),XS(c)
  • Tries
    • Try
      • Q(K);
      • Threat
        • S(C)
      • Vars
        • S(c);N_GUARD,XB(A)::S(C)
        • S(c);N_GUARD,XP(F)::S(C)
        • S(c);N_GUARD,XP(I)::S(C)
        • R(b);N_GUARD::QAB1(K),XR(b)
        • S(c);N_GUARD::S(C)
        • S(c);N_GUARD::S(C),XS(c)
      • Refutation
        • P(e);
  • Actual
    • Q(K);XP(f)
    • Threat
      • QAR1(K)
    • Vars
      • K(d);P-FLIGHT,P_SPINR(b),P_SPINS(c),XP(G)::QAB1(K)
      • S(c);N_GUARD,XP(I)::S(C)
      • R(b);::S(C)
HTML5 logo

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).