MESON Chess Problem Database

Problem Display
PID: 45348 (6K1/2p5/R5R1/P2k2p1/1P1n1b2/1p1P4/2B4B/4Q2b w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

6K1/2p5/R5R1/P2k2p1/1P1n1b2/1p1P4/2B4B/4Q2b

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Qxe4#
    • 1...Bc1
      • 2.Qe5#
    • 1...Bd2
      • 2.Qe5#
    • 1...Be5
      • 2.Qxe5#
    • 1...Sf3
      • 2.Qe4#
  • Tries
    • 1.Rxg5+?
      • 1...Be5
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...Bxg5
        • 2.Qe5#
      • 1...Sf5!
    • 1.Qxh1+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Sf3!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qc5#
      • 1...Ke5
        • 2.Rxg5#
      • 1...Bd6
        • 2.Qc4#
      • 1...Se6
        • 2.Bxb3#
      • 1...c5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::QAB1(A),XB(a)
    • B(d);N_GUARD::QAR1(A)
    • B(d);N_GUARD::QAR1(A),XB(d)
    • S(c);S_CUTB(a)::QAB1(A)
  • Tries
    • Try
      • R(H);CHECK,XP(f)
      • Vars
        • B(d);N_GUARD,XR(H)::QAR1(A)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(A);CHECK,XB(a)
      • Vars
        • K(e);P-FLIGHT,P_SPINB(d)::QAR1(A)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(e);P-FLIGHT,P_SPINB(d),P_SPINS(c)::R(H),XP(f)
      • B(d);::QAB1(A)
      • S(c);N_GUARD::B(B),XP(b)
      • P(g);::QAR1(A),XP(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).