MESON Chess Problem Database

Problem Display
PID: 273270 (1K4b1/4pp2/pQP4R/1p2kPRp/r6N/1nn1p1P1/1B1b4/7B w - - 0 1)

Smith, James Alfred John

The Problemist, 1931

1K4b1/4pp2/pQP4R/1p2kPRp/r6N/1nn1p1P1/1B1b4/7B

#2

10 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qc5#
    • 1...Sc1
      • 2.Qc5#
    • 1...Sd4
      • 2.Qc7#
    • 1...Sa5
      • 2.Qc5#
    • 1...Sc5
      • 2.Qxc5#
  • Tries
    • 1.Bxc3+?
      • 1...Rd4
        • 2.Qc7#
      • 1...Sd4
        • 2.Qc5#
        • 2.Qc7#
      • 1...Bxc3!
    • 1.Qxe3+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Bxe3!
    • 1.Qxb5+?
      • 1...Kd4
        • 2.Qd5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...axb5!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qd5#
      • 1...Rd4
        • 2.Qxe7#
      • 1...Re4
        • 2.Sf3#
      • 1...Sd4
        • 2.Qc7#
      • 1...e6
        • 2.f6#
      • 1...f6
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(b);N_GUARD::QAR2(G)
    • S(b);N_SPINS(c),SBLOCK::QAB(G)
    • S(b);N_GUARD::QAR2(G),XS(b)
  • Tries
    • Try
      • B(B);CHECK,XS(c)
      • Vars
        • R(e);P_SPINR(e)::QAB(G)
      • Refutation
        • B(a);XB(B)
    • Try
      • Q(G);CHECK,XP(d)
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAR1(G),XR(e)
      • Refutation
        • B(a);XQ(G)
    • Try
      • Q(G);CHECK,XP(f)
      • Vars
        • K(g);S_FLIGHT::QAR1(G)
        • S(b);N_GUARD::QAR2(G),XS(b)
      • Refutation
        • P(i);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • R(e);N_SPINS(c),SBLOCK::QAR2(G),XP(j)
      • R(e);SBLOCK::S(D)
      • S(b);N_SPINS(c),SBLOCK::QAB(G)
      • P(j);SBLOCK::R(F)+P(E)
      • P(k);N_GUARD,SBLOCK::S(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).