MESON Chess Problem Database

Problem Display
PID: 43371 (2B2R2/8/3Pnnr1/RN3P1N/2PpkP2/4p1p1/2P3P1/K3Q3 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

2B2R2/8/3Pnnr1/RN3P1N/2PpkP2/4p1p1/2P3P1/K3Q3

#2

13 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.Bb7#
    • 1...Sd7
      • 2.Bb7#
    • 1...Sh7
      • 2.Bb7#
    • 1...Se8
      • 2.Bb7#
    • 1...Sg8
      • 2.Bb7#
  • Tries
    • 1.Bb7+?
      • 1...Sd5
        • 2.Bxd5#
      • 1...Kxf5!
    • 1.Qe2?
      • threat
        • 2.Qd3#
      • 1...Kxf5
        • 2.Sc3#
      • 1...Sxh5
        • 2.Qf3#
      • 1...Sc5
        • 2.Qf3#
      • 1...d3
        • 2.Qxd3#
      • 1...Sxf4!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qd3#
      • 1...Kxf5
        • 2.Sc3#
      • 1...Sxf4
        • 2.Qxd4#
      • 1...Sxh5
        • 2.Qf3#
      • 1...Sc5
        • 2.Qf3#
        • 2.Qxd4#
      • 1...d3
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(f);N_GUARD::B(L)
  • Tries
    • Try
      • B(L);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::B(L),XS(f)
      • Refutation
        • K(d);N_SPINP(a),P_SPINS(f),S_FLIGHT,XP(I)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(d);N_SPINP(a),P_SPINS(e),S_FLIGHT,XP(I)::R(G)+S(H)
        • S(f);XS(J)::QAB1(B)
        • S(e);::QAB1(B)
        • P(c);::QAB1(B),XP(c)
      • Refutation
        • S(e);XP(F)
  • Actual
    • Q(B);N_PINP(a)
    • Threat
      • QAB1(B)
    • Vars
      • K(d);P_SPINS(e),S_FLIGHT,XP(I)::R(G)+S(H)
      • S(e);N_GUARD,XP(F)::QAR1(B),XP(c)
      • S(f);XS(J)::QAB1(B)
      • P(c);::QAB1(B),XP(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).