MESON Chess Problem Database

Problem Display
PID: 190147 (3bN3/4Pn2/r4pN1/p2k1P1K/Q6p/8/bP5p/3B2Bq w - - 0 1)

Windle, REL

The San Francisco Call, 1913

3bN3/4Pn2/r4pN1/p2k1P1K/Q6p/8/bP5p/3B2Bq

#2

9 + 10

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3+
      • 2.Bxf3#
    • 1...Qe4
      • 2.Qb5#
    • 1...Rc6
      • 2.Qd4#
    • 1...Bb1
      • 2.Bb3#
    • 1...Bb3
      • 2.Bxb3#
    • 1...Se5
      • 2.Sf4#
    • 1...Sd6
      • 2.Sxf6#
  • Tries
    • 1.Sxf6+?
      • 1...Kd6
        • 2.Qd7#
        • 2.e8S#
      • 1...Rxf6!
    • 1.Sc7+?
      • 1...Kd6
        • 2.e8S#
      • 1...Bxc7!
    • 1.exd8Q+?
      • 1...Rd6
        • 2.Sxf6#
        • 2.Sc7#
        • 2.Qdxa5#
      • 1...Sd6
        • 2.Sxf6#
        • 2.Sc7#
      • 1...Sxd8!
    • 1.exd8R+?
      • 1...Rd6
        • 2.Sxf6#
        • 2.Sc7#
      • 1...Sd6
        • 2.Sxf6#
        • 2.Sc7#
      • 1...Sxd8!
  • Keys
    • 1.b3!
      • threat
        • 2.Qc4#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...Bxb3
        • 2.Bxb3#
      • 1...Qe4
        • 2.Qb5#
      • 1...Rc6
        • 2.Qd4#
      • 1...Se5
        • 2.Sf4#
      • 1...Sd6
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • Q(a);CHECK,N_GUARD::B(A),XQ(a)
    • Q(a);SBLOCK::QAR2(D)
    • R(g);SBLOCK::QAR1(D)
    • B(b);N_GUARD::B(A)
    • B(b);N_GUARD::B(A),XB(b)
    • S(i);SBLOCK::S(G)
    • S(i);SBLOCK,S_CUTR(g)::S(I),XP(h)
  • Tries
    • Try
      • S(I);CHECK,XP(h)
      • Refutation
        • R(g);XS(I)
    • Try
      • S(I);CHECK
      • Vars
        • K(f);P-FLIGHT::P=S
      • Refutation
        • B(j);XS(I)
    • Try
      • P(H);CHECK,XB(j)
      • Refutation
        • S(i);XQ(H)
    • Try
      • P(H);CHECK,XB(j)
      • Refutation
        • S(i);XR(H)
  • Actual
    • P(C);
    • Threat
      • QAB1(D)
    • Vars
      • Q(a);CHECK,N_GUARD::B(A),XQ(a)
      • B(b);OGATE,XP(C)::B(A),XB(b)
      • Q(a);SBLOCK::QAR2(D)
      • R(g);SBLOCK::QAR1(D)
      • S(i);SBLOCK::S(G)
      • S(i);SBLOCK,S_CUTR(g)::S(I),XP(h)
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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).