MESON Chess Problem Database

Problem Display
PID: 192729 (6b1/b4B2/2p1p1Q1/R1r1P3/1rkN3K/P7/5N2/B7 w - - 0 1)

McDowell, Michael

4/6 HM., BCPS U-21 Ty., 1980

6b1/b4B2/2p1p1Q1/R1r1P3/1rkN3K/P7/5N2/B7

#2

9 + 7

56 The Problemist 1981

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qxe6#
    • 1...Rd5
      • 2.Qc2#
      • 2.Qd3#
    • 1...Rxe5
      • 2.Qc2#
      • 2.Qd3#
  • Tries
    • 1.Bxe6+?
      • 1...Rd5
        • 2.Qc2#
        • 2.Qd3#
      • 1...Bxe6!
    • 1.Rxc5+?
      • 1...Bxc5
        • 2.Qxe6#
      • 1...Kxc5!
  • Keys
    • 1.Sxe6!
      • threat
        • 2.Qd3#
      • 1...Kb3+
        • 2.Sd4#
      • 1...Kd5+
        • 2.Sf4#
      • 1...Rb3
        • 2.Qe4#
      • 1...Rd5
        • 2.Qc2#
      • 1...Bh7
        • 2.Sxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);P_PINS(D),P_SPINR(c),S_FLIGHT::QAB1(H),XP(e)
  • Tries
    • Try
      • B(I);CHECK,XP(e)
      • Refutation
        • B(g);XB(I)
    • Try
      • R(F);CHECK,XR(c)
      • Vars
        • B(f);SBLOCK,XR(F)::QAB(H),XP(e)
      • Refutation
        • K(b);N_SPINP(e),P-FLIGHT,P_PINS(D),XR(F)
  • Actual
    • S(D);XP(e)
    • Threat
      • QAB1(H)
    • Vars
      • K(b);CHECK,S_FLIGHT::B(I)+S(D),DCHECK
      • K(b);CHECK,P_SPINR(c),S_FLIGHT::B(I)+S(D),DCHECK
      • R(a);SBLOCK::QAR2(H)
      • R(c);::QAR2(H)
      • B(g);N_GUARD::B(I)+S(D),XR(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).