MESON Chess Problem Database

Problem Display
PID: 158704 (5N2/4p2Q/pP4P1/qp1k2nR/NR1p2p1/3p1P1b/3P2pB/6K1 w - - 0 1)

Karlstrom, Alfred Olaf

Comm., SEPA, 1946

5N2/4p2Q/pP4P1/qp1k2nR/NR1p2p1/3p1P1b/3P2pB/6K1

#2

11 + 11

133 The Problemist Supplement 2015

SOLUTION

  • SOUND
  • Sets
    • 1...e5
      • 2.Qd7#
    • 1...e6
      • 2.Qb7#
      • 2.Qd7#
  • Tries
    • 1.Rxg5+?
      • 1...e5
        • 2.Qd7#
      • 1...Kc6!
    • 1.Qg8+?
      • 1...e6
        • 2.Qxe6#
      • 1...Kc6!
    • 1.Qf7+?
      • 1...e6
        • 2.Qxe6#
        • 2.Qb7#
        • 2.Qd7#
      • 1...Kc6!
  • Keys
    • 1.Qxe7!
      • threat
        • 2.Qc5#
        • 2.Qd6#
        • 2.Qe4#
        • 2.Qe6#
        • 2.Qb7#
        • 2.Qd7#
      • 1...Kc6
        • 2.Qd7#
      • 1...Qxb4
        • 2.Qe6#
      • 1...Qxb6
        • 2.Qe4#
      • 1...Qxa4
        • 2.Qd6#
      • 1...gxf3
        • 2.Qb7#
      • 1...bxa4
        • 2.Qd6#
      • 1...g3
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • P(k);N_SPINS(i),OGATE::QAR2(J)
  • Tries
    • Try
      • R(G);CHECK,XS(i)
      • Vars
        • P(k);OGATE,P_SPINP(k)::QAR2(J)
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • Q(J);CHECK
      • Vars
        • P(k);P_SPINP(k)::QAB1(J),XP(k)
      • Refutation
        • K(h);N_SPINS(i),S_FLIGHT
    • Try
      • Q(J);CHECK
      • Refutation
        • K(h);N_SPINS(i),S_FLIGHT
  • Actual
    • Q(J);XP(k)
    • Threat
      • DUALS(6)
    • Vars
      • K(h);N_SPINS(i),S_FLIGHT::QAB1(J)
      • Q(f);XR(F)::QAB1(J)
      • Q(f);XP(H)::QAB1(J)
      • Q(f);XS(E)::QAR1(J)
      • P(e);XP(D)::QAB(J)
      • P(g);XS(E)::QAR1(J)
      • P(e);::QAR1(J)
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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).