MESON Chess Problem Database

Problem Display
PID: 64097 (b5nB/b4PqB/3prr1N/R1ppk2P/7Q/2P3P1/1n2NR2/6K1 w - - 0 1)

Sheppard, Charles William

Good Companions (January), 1920

b5nB/b4PqB/3prr1N/R1ppk2P/7Q/2P3P1/1n2NR2/6K1

#2

12 + 11

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh6
      • 2.Rf5#
    • 1...Qf8
      • 2.Sg4#
      • 2.Rf5#
      • 2.Qg5#
      • 2.Qf4#
    • 1...Qxh8
      • 2.Sg4#
    • 1...Qxg3+
      • 2.Qxg3#
    • 1...Qg4
      • 2.Sxg4#
    • 1...Qg5
      • 2.Qxg5#
    • 1...Qg6
      • 2.Qf4#
    • 1...Qxf7
      • 2.Sg4#
      • 2.Sxf7#
      • 2.Rf5#
      • 2.Qg5#
      • 2.Qf4#
    • 1...Qxh7
      • 2.Qf4#
    • 1...Rxf2
      • 2.Sg4#
    • 1...Rf3
      • 2.Sg4#
    • 1...Rf4
      • 2.Qxf4#
    • 1...Rf5
      • 2.Rxf5#
    • 1...Rg6
      • 2.Rf5#
      • 2.Qf4#
    • 1...Rxh6
      • 2.Rf5#
      • 2.Qg5#
      • 2.Qf4#
    • 1...Rxf7
      • 2.Sg4#
      • 2.Sxf7#
    • 1...c4
      • 2.Qe4#
    • 1...d4
      • 2.Qxd4#
  • Tries
    • 1.Qg5+?
      • 1...Rf5
        • 2.Qxf5#
      • 1...Qxg5!
  • Keys
    • 1.Sc1!
      • threat
        • 2.Re2#
      • 1...Qxg3+
        • 2.Qxg3#
      • 1...Qxh6
        • 2.Rf5#
      • 1...Qxh7
        • 2.Qf4#
      • 1...Rxf2
        • 2.Sg4#
      • 1...d4
        • 2.Qxd4#
      • 1...Qg4
        • 2.Sxg4#
      • 1...Qg5
        • 2.Qxg5#
      • 1...Qg6
        • 2.Qf4#
      • 1...Rf3
        • 2.Sg4#
      • 1...Rf4
        • 2.Qxf4#
      • 1...Sd1
        • 2.Sd3#
      • 1...Sc4
        • 2.Sd3#
      • 1...c4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(i);N_PINP(E),P_SPINR(g),XS(I)::R1(C)
    • Q(i);N_GUARD,N_PINP(E),XB(L)::S(I)
    • Q(i);CHECK,OGATE,P_SPINR(g),XP(E)::QAB(F),XQ(i)
    • Q(i);N_GUARD,P_SPINR(g)::S(I),XQ(i)
    • Q(i);N_GUARD,P_SPINR(g)::QAR2(F),XQ(i)
    • Q(i);P_SPINR(g)::QAB1(F)
    • Q(i);N_PINP(E),P_SPINR(g),XB(K)::QAB1(F)
    • R(g);P_SPINQ(i),XR(C)::S(I)
    • R(g);P_SPINQ(i)::S(I)
    • R(g);N_GUARD,P_SPINQ(i)::QAB1(F),XR(g)
    • R(g);N_GUARD,P_SPINQ(i)::R1(C),XR(g)
    • P(b);P_PINR(C),P_SPINP(c)::QAR1(F)
    • P(c);P_SPINP(b)::QAB1(F),XP(c)
  • Tries
    • Try
      • Q(F);CHECK,N_SPINP(E)
      • Vars
        • R(g);N_GUARD,P_SPINQ(i),P_SPINR(g)::QAR1(F),XR(g)
      • Refutation
        • Q(i);P_PINP(E),P_SPINR(g),XQ(F)
  • Actual
    • S(B);
    • Threat
      • R(C)
    • Vars
      • Q(i);CHECK,OGATE,P_SPINR(g),XP(E)::QAB(F),XQ(i)
      • Q(i);N_PINP(E),P_SPINR(g),XS(I)::R1(C)
      • Q(i);N_PINP(E),P_SPINR(g),XB(K)::QAB1(F)
      • R(g);P_SPINQ(i),XR(C)::S(I)
      • P(c);P_SPINP(b)::QAB1(F),XP(c)
      • Q(i);N_GUARD,P_SPINR(g)::S(I),XQ(i)
      • Q(i);N_GUARD,P_SPINR(g)::QAR2(F),XQ(i)
      • Q(i);P_SPINR(g)::QAB1(F)
      • R(g);P_SPINQ(i)::S(I)
      • R(g);N_GUARD,P_SPINQ(i)::QAB1(F),XR(g)
      • S(a);N_GUARD::S(B)
      • P(b);P_PINR(C),P_SPINP(c)::QAR1(F)
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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).