MESON Chess Problem Database

Problem Display
PID: 203327 (1B4R1/5p2/5pb1/8/2pb3n/7K/Q6P/R4Nk1 w - - 0 1)

Palkoska, Emil

6/7 HM, L'Alfiere di Re, 1924

1B4R1/5p2/5pb1/8/2pb3n/7K/Q6P/R4Nk1

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kh1
      • 2.Sg3#
    • 1...Be3
      • 2.Sxe3#
    • 1...Bc5
      • 2.Se3#
    • 1...Bb6
      • 2.Se3#
    • 1...Ba7
      • 2.Se3#
    • 1...Sg2
      • 2.Qxg2#
    • 1...Sf3
      • 2.Qg2#
    • 1...Sf5
      • 2.Qg2#
    • 1...c3
      • 2.Se3#
  • Tries
    • 1.Sg3+?
      • 1...Bb1
        • 2.Rxb1#
      • 1...Bxa1!
    • 1.Rxg6+?
      • 1...Kh1
        • 2.Sg3#
      • 1...Sg2
        • 2.Qxg2#
      • 1...Sxg6
        • 2.Qg2#
      • 1...fxg6!
  • Keys
    • 1.Ba7!
      • 1...Kh1
        • 2.Sg3#
      • 1...Bxa7
        • 2.Se3#
      • 1...Bf2
        • 2.Sd2#
      • 1...Be3
        • 2.Sxe3#
      • 1...Bc5
        • 2.Se3#
      • 1...Bb6
        • 2.Se3#
      • 1...Sg2
        • 2.Qxg2#
      • 1...Sf3
        • 2.Qg2#
      • 1...Sf5
        • 2.Sg3#
        • 2.Qg2#
      • 1...c3
        • 2.Se3#
      • 1...f5
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(a);N_SPINB(f),P-FLIGHT::R(A)+S(B),DCHECK
    • B(c);N_GUARD::R(A)+S(B),XB(c)
    • B(c);N_GUARD::R(A)+S(B)
    • S(d);N_GUARD,N_SPINB(f)::QAR1(C),XS(d)
    • S(d);N_GUARD::QAR1(C)
    • P(b);S_CUTB(c)::R(A)+S(B)
  • Tries
    • Try
      • S(B);CHECK,N_PINB(f)
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::R(A),XB(f)
      • Refutation
        • B(c);XR(A)
    • Try
      • R(G);CHECK,XB(f)
      • Vars
        • K(a);P-FLIGHT::R(A)+S(B),DCHECK
        • S(d);N_GUARD,P_SPINS(d)::QAR1(C),XS(d)
        • S(d);N_GUARD,XR(G)::QAR1(C)
      • Refutation
        • P(g);XR(G)
  • Actual
    • B(F);N_PINB(f),P_PINB(c)
    • Vars
      • K(a);N_SPINB(c),P-FLIGHT::R(A)+S(B),DCHECK
      • B(c);N_GUARD,N_SPINB(c),P_SPINB(f),XB(F)::R(A)+S(B)
      • B(c);::R(A)+S(B)
      • B(c);N_GUARD::R(A)+S(B),XB(c)
      • B(c);N_GUARD::R(A)+S(B)
      • S(d);N_GUARD::QAR1(C),XS(d)
      • S(d);N_GUARD::QAR1(C)
      • P(b);::R(A)+S(B)
      • P(e);S_CUTB(f)::R(A)+S(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).