MESON Chess Problem Database

Problem Display
PID: 204393 (4R3/8/5p1B/4NkN1/2K5/3P1q2/8/2b2RnQ w - - 0 1)

Rothstein, Louis

L'Alfiere di Re, 1925

4R3/8/5p1B/4NkN1/2K5/3P1q2/8/2b2RnQ

#2

8 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf1
      • 2.Qe4#
    • 1...Qf2
      • 2.Qe4#
    • 1...Qf4+
      • 2.Qe4#
  • Tries
    • 1.Qxf3+?
      • 1...Bf4
        • 2.Qe4#
        • 2.Qg4#
        • 2.Qxf4#
      • 1...Sxf3!
    • 1.Qh3+?
      • 1...Kf4
        • 2.Sg6#
        • 2.Sgxf3#
        • 2.Se4#
        • 2.Sgf7#
        • 2.Sh7#
      • 1...Sxh3!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Qg4#
      • 1...Qf4+
        • 2.Se4#
      • 1...Kf4
        • 2.Se4#
      • 1...fxe5
        • 2.Rf8#
      • 1...fxg5
        • 2.Qf7#
      • 1...Bf4
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_SPINQ(c),OGATE,P_PINP(C),XR(A)::QAB1(B)
    • Q(c);OGATE::QAB1(B)
    • Q(c);CHECK,OGATE::QAB1(B)
  • Tries
    • Try
      • Q(B);CHECK,XQ(c)
      • Refutation
        • S(b);P_SPINS(b),XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • S(b);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • Q(c);CHECK,S_CUTB(a)::QAR(B)+S(F)
      • K(d);P-FLIGHT::B(G)+S(F)
      • P(e);OGATEB,SBLOCK,XS(E)::R(H)
      • P(e);OGATEB,P_SPINP(e),XS(F)::QAR2(B)
      • B(a);N_SPINQ(c),SBLOCK::QAB1(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).