MESON Chess Problem Database

Problem Display
PID: 141601 (8/b7/8/8/2K5/2nQ4/3p4/4kBR1 w - - 0 1)

Paslack, Rainer

Die Schwalbe, 1969

8/b7/8/8/2K5/2nQ4/3p4/4kBR1

#2

4 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kd1
      • 2.Be2#
    • 1...Kf2
      • 2.Qg3#
    • 1...Sb1
      • 2.Qe2#
    • 1...Sd1
      • 2.Qe2#
    • 1...Sa2
      • 2.Qe2#
    • 1...Se2
      • 2.Qxe2#
    • 1...Sa4
      • 2.Qe2#
    • 1...Se4
      • 2.Qe2#
    • 1...Sb5
      • 2.Qe2#
    • 1...Sd5
      • 2.Qe2#
  • Tries
    • 1.Bg2+?
      • 1...Bxg1
        • 2.Qf1#
      • 1...Kf2!
    • 1.Qe3+?
      • 1...Kd1
        • 2.Bd3#
      • 1...Se2
        • 2.Bxe2#
        • 2.Bg2#
        • 2.Bh3#
        • 2.Qxe2#
      • 1...Bxe3!
    • 1.Qg3+?
      • 1...Bf2
        • 2.Bd3#
      • 1...Kd1!
  • Keys
    • 1.Bh3+!
      • 1...Kf2
        • 2.Rf1#
      • 1...Bxg1
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • K(a);P-FLIGHT,P_SPINP(b)::R(B)+B(A),DCHECK
    • K(a);S_FLIGHT::QAB1(C)
    • S(c);N_GUARD::QAR1(C)
    • S(c);N_GUARD::QAR1(C),XS(c)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • B(d);XR(B)::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::R(B)+B(A)
      • Refutation
        • B(d);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • B(d);P_SPINB(d)::R(B)+B(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • B(A);CHECK
    • Vars
      • K(a);S_FLIGHT::R1(B)
      • B(d);XR(B)::QAR1(C)
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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).