MESON Chess Problem Database

Problem Display
PID: 275765 (4R3/b6K/5P1R/3N1kp1/2n5/2p4b/B2n2PP/3Q4 w - - 0 1)

Dittrich, Kurt

Schackvarlden, 1939

4R3/b6K/5P1R/3N1kp1/2n5/2p4b/B2n2PP/3Q4

#2

9 + 7

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qf3#
    • 1...Sf1
      • 2.Qf3#
    • 1...Sb3
      • 2.Qf3#
    • 1...Sf3
      • 2.Qxf3#
    • 1...Se4
      • 2.Qf3#
    • 1...g4
      • 2.Rh5#
  • Tries
    • 1.Bb1+?
      • 1...Sxb1
        • 2.Qf3#
      • 1...Se4
        • 2.Bxe4#
        • 2.Qf3#
      • 1...c2!
    • 1.Qc2+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Kg4!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qd7#
      • 1...Kg4
        • 2.Qd7#
      • 1...Se5
        • 2.Se7#
      • 1...Sb6
        • 2.Se3#
      • 1...g4
        • 2.Rh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(a);N_GUARD::QAR2(A)
    • S(a);N_GUARD::QAR2(A),XS(a)
    • P(f);OGATEB::R(G)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • S(a);XB(B)::QAR2(A)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • K(e);P_SPINS(d),S_FLIGHT::QAB(A)
      • S(d);SBLOCK::S(E)
      • S(d);N_GUARD,S_CUTB(g)::S(E)
      • P(f);OGATEB,SBLOCK::R(G)
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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).