MESON Chess Problem Database

Problem Display
PID: 194255 (8/7b/2NR3P/8/2pB4/b2k2pQ/1R4n1/2K3n1 w - - 0 1)

Richmond, OH

Pittsburgh Sun, 1917

8/7b/2NR3P/8/2pB4/b2k2pQ/1R4n1/2K3n1

#2

7 + 7

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Se5#
    • 1...Bf5
      • 2.Qxf5#
    • 1...Bg8
      • 2.Qf5#
  • Tries
    • 1.Qxg2?
      • threat
        • 2.Se5#
        • 2.Qc2#
      • 1...Se2+
        • 2.Qxe2#
      • 1...Bxd6
        • 2.Rd2#
        • 2.Qc2#
      • 1...Sf3
        • 2.Qxf3#
        • 2.Qc2#
        • 2.Qe2#
      • 1...c3
        • 2.Se5#
      • 1...Bxb2+!
  • Keys
    • 1.Qe6!
      • 1...Bxb2+
        • 2.Bxb2#
      • 1...Se2+
        • 2.Qxe2#
      • 1...Bxd6
        • 2.Rd2#
      • 1...Bb4
        • 2.Sxb4#
      • 1...Bc5
        • 2.Rd2#
      • 1...Be4
        • 2.Se5#
      • 1...Bf5
        • 2.Qxf5#
      • 1...Bg6
        • 2.Qxg6#
      • 1...Bg8
        • 2.Qf5#
        • 2.Qg6#
      • 1...Sf3
        • 2.Qe2#
      • 1...Sh3
        • 2.Qe2#
      • 1...Se1
        • 2.Qe3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sf4
        • 2.Qe3#
      • 1...Sh4
        • 2.Qe3#
      • 1...c3
        • 2.Bc5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 13
    • REMOVED MATES = 1
  • Sets
    • B(g);SBLOCK::S(E)
    • B(g);N_GUARD::QAB(C),XB(g)
    • B(g);N_GUARD::QAB(C)
  • Tries
    • Try
      • Q(C);N_PINP(e),XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);CHECK,N_GUARD::QAB1(C),XS(a)
        • P(f);::S(E)
      • Refutation
        • B(c);CHECK,XR(B)
  • Actual
    • Q(C);N_PINP(e)
    • Vars
      • B(c);CHECK,OGATE,XR(B)::R(F)+B(D),XB(c)
      • S(a);CHECK,N_GUARD::QAB1(C),XS(a)
      • B(c);N_PINR(B),XR(F)::R1(B)
      • B(c);N_GUARD,N_PINR(B)::S(E),XB(c)
      • B(c);N_PINR(B)::R1(B)
      • B(g);SBLOCK::S(E)
      • B(g);N_GUARD::QAB(C),XB(g)
      • S(a);N_GUARD::QAB1(C)
      • S(b);N_GUARD::QAR1(C)
      • S(b);N_GUARD::QAR1(C),XS(b)
      • P(f);SBLOCK::R(F)+B(D)
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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).