MESON Chess Problem Database

Problem Display
PID: 138984 (3K4/1B1pp3/4p3/N3kn1N/1Q4Pp/2p4r/8/2b5 w - - 0 1)

Boorer, PA

The Problemist, 1936

3K4/1B1pp3/4p3/N3kn1N/1Q4Pp/2p4r/8/2b5

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Qf4#
    • 1...Bb2
      • 2.Qf4#
    • 1...Ba3
      • 2.Qf4#
    • 1...Bf4
      • 2.Qxf4#
    • 1...Se3
      • 2.Qf4#
    • 1...Sd4
      • 2.Sc4#
    • 1...Sd6
      • 2.Qc5#
    • 1...d5
      • 2.Sc6#
    • 1...d6
      • 2.Qe4#
  • Tries
    • 1.Kxd7?
      • threat
        • 2.Qc5#
        • 2.Qe4#
      • 1...Re3
        • 2.Qc5#
        • 2.Qf4#
      • 1...Ba3
        • 2.Qe4#
        • 2.Qf4#
      • 1...Be3
        • 2.Qe4#
      • 1...Se3
        • 2.Qxc3#
        • 2.Qe4#
        • 2.Qf4#
      • 1...Sg3
        • 2.Qxc3#
        • 2.Qc5#
      • 1...Sd4
        • 2.Sc4#
        • 2.Qc5#
      • 1...Sd6
        • 2.Qc5#
      • 1...Rd3+!
    • 1.Qxc3+?
      • 1...Kd6
        • 2.Qc7#
      • 1...Sd4
        • 2.Sc4#
      • 1...Rxc3!
    • 1.Qd4+?
      • 1...Sxd4
        • 2.Sc4#
      • 1...Kxd4!
  • Keys
    • 1.Kc7!
      • threat
        • 2.Qe4#
      • 1...Re3
        • 2.Qf4#
      • 1...Sg3
        • 2.Qxc3#
      • 1...Sd4
        • 2.Sc4#
      • 1...Sd6
        • 2.Qc5#
      • 1...d5
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(c);S_CUTB(a)::QAB1(A)
    • B(a);N_GUARD::QAB1(A)
    • B(a);N_GUARD::QAB1(A),XB(a)
    • S(f);S_CUTB(a)::QAB1(A)
    • S(f);SBLOCK::S(C)
    • S(f);S_CUTP(h)::QAR2(A)
    • P(h);N_GUARD,SBLOCK::S(C)
    • P(h);SBLOCK::QAR1(A)
  • Tries
    • Try
      • K(F);P-FLIGHT,XP(h)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAR1(A)
        • S(f);::QAR2(A)
      • Refutation
        • R(c);CHECK
    • Try
      • Q(A);CHECK,XP(b)
      • Vars
        • K(e);S_FLIGHT::QAB1(A)
        • S(f);P_SPINS(f)::S(C)
      • Refutation
        • R(c);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • S(f);SBLOCK,XQ(A)::S(C)
      • Refutation
        • K(e);S_FLIGHT,XQ(A)
  • Actual
    • K(F);S_FLIGHT
    • Threat
      • QAR1(A)
    • Vars
      • R(c);S_CUTB(a)::QAB1(A)
      • S(f);N_GUARD,S_CUTR(c)::QAB(A),XP(b)
      • S(f);SBLOCK::S(C)
      • S(f);S_CUTP(h)::QAR2(A)
      • P(h);N_GUARD,SBLOCK::S(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).