MESON Chess Problem Database

Problem Display
PID: 195164 (BB4K1/1q3QN1/8/rr6/1p2k2n/np2pN1R/4P3/1b2b3 w - - 0 1)

Beach, Lennox F

Densmore MT (Pittsburgh Gazette-Times), 1918

BB4K1/1q3QN1/8/rr6/1p2k2n/np2pN1R/4P3/1b2b3

#2

8 + 11

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qe6#
    • 1...Rd5
      • 2.Qf4#
    • 1...Bd2
      • 2.Rxh4#
    • 1...Bc3
      • 2.Rxh4#
    • 1...Sc4
      • 2.Qxc4#
  • Tries
    • 1.Bxb7+?
      • 1...Rd5
        • 2.Qe6#
        • 2.Qe8#
        • 2.Qf4#
        • 2.Qe7#
      • 1...Rxb7!
    • 1.Qxb7+?
      • 1...Rd5
        • 2.Qe7#
      • 1...Rxb7!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qd4#
      • 1...Qd5+
        • 2.Qe6#
      • 1...Sxf3
        • 2.exf3#
      • 1...Rd5
        • 2.Qg4#
      • 1...Bc3
        • 2.Rxh4#
      • 1...Sc2
        • 2.Qd3#
      • 1...Sf5
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(k);P_PINQ(D),S_CUTR(j)::QAR2(D)
    • R(j);N_SPINQ(k),SBLOCK::QAR1(D)
    • B(b);N_GUARD::R(C),XS(h)
    • S(c);N_GUARD::QAR2(D),XS(c)
  • Tries
    • Try
      • B(F);CHECK,XQ(k)
      • Refutation
        • R(j);XB(F)
    • Try
      • Q(D);CHECK,XQ(k)
      • Vars
        • R(j);P_SPINR(j)::QAR(D)
      • Refutation
        • R(j);P_SPINR(j),XQ(D)
  • Actual
    • Q(D);
    • Threat
      • QAR1(D)
    • Vars
      • Q(k);CHECK,S_CUTR(j)::QAR2(D)
      • S(h);OGATE,XS(B)::P(A),XS(h)
      • R(j);N_SPINQ(k),SBLOCK::QAR2(D)
      • B(b);N_GUARD::R(C),XS(h)
      • S(c);S_CUTB(a)::QAB1(D)
      • S(h);S_CUTR(j)::S(B)
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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).