MESON Chess Problem Database

Problem Display
PID: 220397 (6n1/3N2PK/7p/7k/4p2P/1p2p2P/1Pp1p3/2Q1B3 w - - 0 1)

Torngren, Pehr Hendrik

Die Schwalbe, 1928

6n1/3N2PK/7p/7k/4p2P/1p2p2P/1Pp1p3/2Q1B3

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sf6+
      • 2.Sxf6#
    • 1...Se7
      • 2.Sf6#
  • Tries
    • 1.Qd2?
      • threat
        • 2.Qa5#
        • 2.Qxe2#
        • 2.Qd5#
      • 1...Sf6+
        • 2.Sxf6#
      • 1...c1Q
        • 2.Qxe2#
        • 2.Qd5#
      • 1...c1S
        • 2.Qa5#
        • 2.Qd5#
      • 1...c1R
        • 2.Qxe2#
        • 2.Qd5#
      • 1...Se7
        • 2.Sf6#
        • 2.Qxe2#
      • 1...exd2!
    • 1.Qxc2?
      • threat
        • 2.Qxe2#
        • 2.Qc5#
      • 1...Sf6+
        • 2.Sxf6#
      • 1...Se7
        • 2.Sf6#
        • 2.Qxe2#
      • 1...bxc2!
  • Keys
    • 1.Qxe3!
      • threat
        • 2.Qc5#
        • 2.Qxe2#
      • 1...Sf6+
        • 2.Sxf6#
      • 1...c1Q
        • 2.Qxe2#
      • 1...c1S
        • 2.Qc5#
      • 1...c1B
        • 2.Qxe2#
      • 1...c1R
        • 2.Qxe2#
      • 1...Se7
        • 2.Sf6#
        • 2.Qxh6#
        • 2.Qxe2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(h);CHECK,N_GUARD::S(F),XS(h)
    • S(h);N_GUARD::S(F)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(h);CHECK,N_GUARD::S(F),XS(h)
      • Refutation
        • P(d);XQ(A)
    • Try
      • Q(A);XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • S(h);CHECK,N_GUARD::S(F),XS(h)
      • Refutation
        • P(c);XQ(A)
  • Actual
    • Q(A);XP(d)
    • Threat
      • DUALS(2)
    • Vars
      • S(h);CHECK,N_GUARD::S(F),XS(h)
      • P(a);::QAB(A),XP(b)
      • P(a);::QAR(A)
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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).