MESON Chess Problem Database

Problem Display
PID: 17551 (1B4Kn/1p2R3/b1p1Q3/1q3P2/1P2PP2/1NRPk3/8/3B3N w - - 0 1)

Sommer, Bruno Oswald

Schach-Express, 1947

1B4Kn/1p2R3/b1p1Q3/1q3P2/1P2PP2/1NRPk3/8/3B3N

#2

13 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.dxc4#
    • 1...Qd5
      • 2.exd5#
    • 1...Qxf5
      • 2.exf5#
  • Tries
    • 1.Rh7?
      • threat
        • 2.Rh3#
      • 1...Qxf5
        • 2.exf5#
      • 1...Qe5!
    • 1.Qg6?
      • threat
        • 2.Qg1#
        • 2.Qg3#
      • 1...Qc4+
        • 2.dxc4#
      • 1...Qd5+
        • 2.exd5#
      • 1...Qe5
        • 2.Qg3#
      • 1...Sxg6!
  • Keys
    • 1.Qh6!
      • threat
        • 2.Qh3#
      • 1...Qc4+
        • 2.dxc4#
      • 1...Qd5+
        • 2.exd5#
      • 1...Qxf5
        • 2.exf5#
      • 1...Qe5
        • 2.fxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(b);OGATE,P_PINQ(J)::R(D)+P(E),XQ(b)
    • Q(b);OGATE,P_PINQ(J)::QAR(J)+P(G),XQ(b)
    • Q(b);OGATE,XP(I)::QAR(J)+P(G),XQ(b)
  • Tries
    • Try
      • R(K);
      • Threat
        • R(K)
      • Vars
        • Q(b);OGATE,XP(I)::QAR(J)+P(G),XQ(b)
      • Refutation
        • Q(b);
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);CHECK,OGATE::R(D)+P(E),XQ(b)
        • Q(b);CHECK,OGATE::R(K)+P(G),XQ(b)
        • Q(b);::QAR2(J)
      • Refutation
        • S(f);XQ(J)
  • Actual
    • Q(J);
    • Threat
      • QAR(J)
    • Vars
      • Q(b);CHECK,OGATE::R(D)+P(E),XQ(b)
      • Q(b);CHECK,OGATE::R(K)+P(G),XQ(b)
      • Q(b);OGATE,XP(I)::R(K)+P(G),XQ(b)
      • Q(b);OGATE::QAB(J)+P(H),XQ(b)
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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).