MESON Chess Problem Database

Problem Display
PID: 227329 (8/1p6/1B6/4N3/8/K1k1p3/2b1r3/2R2Q2 w - - 0 1)

Dohrn-Luttgens, Julius

Die Schwalbe, 1928

8/1p6/1B6/4N3/8/K1k1p3/2b1r3/2R2Q2

#2

5 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kd2
      • 2.Ba5#
    • 1...Re1
      • 2.Qd3#
      • 2.Qxe1#
    • 1...Rd2
      • 2.Qc4#
    • 1...Rf2
      • 2.Qd3#
    • 1...Rg2
      • 2.Qd3#
    • 1...Rh2
      • 2.Qd3#
  • Tries
    • 1.Rxc2+?
      • 1...Rxc2
        • 2.Qd3#
      • 1...Kxc2!
    • 1.Qf4?
      • threat
        • 2.Ba5#
        • 2.Qb4#
        • 2.Qd4#
      • 1...Rd2
        • 2.Ba5#
        • 2.Qb4#
        • 2.Qc4#
      • 1...Kd2!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qd3#
      • 1...Kd2
        • 2.Qxc2#
      • 1...Rd2
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • K(c);N_SPINB(a),S_FLIGHT::B(E)
    • R(b);OGATE,SBLOCK::QAR1(B)
    • R(b);OGATE::QAR1(B)
  • Tries
    • Try
      • R(A);CHECK,XB(a)
      • Vars
        • R(b);OGATE,XR(A)::QAR1(B)
      • Refutation
        • K(c);P-FLIGHT,XR(A)
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Refutation
        • K(c);N_SPINB(a),P_SPINP(d),S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(c);N_SPINB(a),S_FLIGHT::QAR1(B),XB(a)
      • R(b);SBLOCK::QAR(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).