MESON Chess Problem Database

Problem Display
PID: 45359 (6Q1/2Bp2RB/1p2r2p/R1b2N2/2pPkNp1/8/2K2pP1/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

6Q1/2Bp2RB/1p2r2p/R1b2N2/2pPkNp1/8/2K2pP1/8

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rc6
      • 2.Qd5#
    • 1...Rf6
      • 2.Qd5#
    • 1...Rg6
      • 2.Qd5#
    • 1...Re7
      • 2.Qd5#
    • 1...Re8
      • 2.Qd5#
    • 1...d5
      • 2.Qxe6#
  • Tries
    • 1.Qa8+?
      • 1...d5
        • 2.Qxd5#
      • 1...Rc6!
  • Keys
    • 1.Se2!
      • threat
        • 2.Sc3#
      • 1...Kd5
        • 2.Se7#
      • 1...Bxd4
        • 2.Seg3#
        • 2.Rxg4#
      • 1...Re5
        • 2.Rxg4#
      • 1...Rd6
        • 2.Rxg4#
      • 1...Rg6
        • 2.Seg3#
      • 1...Bb4
        • 2.Seg3#
        • 2.Rxg4#
      • 1...Bd6
        • 2.Qa8#
      • 1...c3
        • 2.Sxc3#
      • 1...d6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • R(g);OGATE::QAB1(J)
    • P(i);N_GUARD::QAR2(J),XR(g)
  • Tries
    • Try
      • Q(J);CHECK
      • Vars
        • P(i);P_SPINP(i)::QAB1(J),XP(i)
      • Refutation
        • R(g);P_SPINR(g)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(c);P_SPINB(e),P_SPINR(g),S_FLIGHT::S(F)
      • R(g);::R(H),XP(d)
      • R(g);::S(D)
      • B(e);S_CUTP(i),S_CUTR(g)::QAB(J)
      • P(b);::S(D),XP(b)
      • P(i);N_GUARD::QAR2(J),XR(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).