MESON Chess Problem Database

Problem Display
PID: 45546 (1B4B1/8/3r1p2/1n3k1P/4n2K/8/6N1/Q3R3 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1B4B1/8/3r1p2/1n3k1P/4n2K/8/6N1/Q3R3

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Se3#
    • 1...Rd2
      • 2.Se3#
    • 1...Rd4
      • 2.Se3#
    • 1...Rd5
      • 2.Se3#
    • 1...Ra6
      • 2.Se3#
    • 1...Rb6
      • 2.Se3#
    • 1...Rc6
      • 2.Se3#
    • 1...Re6
      • 2.Se3#
      • 2.Bh7#
    • 1...Rd7
      • 2.Se3#
    • 1...Rd8
      • 2.Se3#
    • 1...Sd2
      • 2.Bh7#
    • 1...Sf2
      • 2.Bh7#
    • 1...Sec3
      • 2.Bh7#
    • 1...Sg3
      • 2.Bh7#
    • 1...Sc5
      • 2.Bh7#
  • Tries
    • 1.Be6+?
      • 1...Rxe6
        • 2.Se3#
      • 1...Kxe6!
    • 1.Rxe4?
      • threat
        • 2.Bh7#
        • 2.Rf4#
      • 1...Rd4
        • 2.Bh7#
      • 1...Rd7
        • 2.Rf4#
      • 1...Sc3
        • 2.Bh7#
      • 1...Sd4
        • 2.Bh7#
      • 1...Kxe4!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qf4#
      • 1...Ke5
        • 2.Qc5#
      • 1...Rd2
        • 2.Se3#
      • 1...Sd2
        • 2.Bh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 12
  • Sets
    • R(d);::S(C)
    • S(a);::B(G)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • R(d);SBLOCK,XB(G)::S(C)
      • Refutation
        • K(c);P_SPINS(a),S_FLIGHT,XB(G)
    • Try
      • R(B);XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • R(d);P_PINR(B)::B(G)
        • R(d);::R1(B)
        • S(b);::B(G)
      • Refutation
        • K(c);S_FLIGHT,XR(B)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(c);P-FLIGHT,P_SPINR(d),P_SPINS(a)::QAR2(A)
      • R(d);::S(C)
      • S(a);::B(G)
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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).