MESON Chess Problem Database

Problem Display
PID: 204327 (BB6/K2Q1qN1/2P5/8/3Pk3/p3p1p1/2P2pr1/1n1R1N2 w - - 0 1)

Ellerman, Arnoldo

L'Alfiere di Re, 1925

BB6/K2Q1qN1/2P5/8/3Pk3/p3p1p1/2P2pr1/1n1R1N2

#2

10 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Qf5#
    • 1...Qb3
      • 2.Qf5#
    • 1...Qc4
      • 2.Qf5#
    • 1...Qd5
      • 2.Qg4#
    • 1...Qe8
      • 2.Qf5#
    • 1...Qg8
      • 2.Qf5#
    • 1...Qf3
      • 2.Qe6#
    • 1...Qf4
      • 2.c7#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qxd7+
      • 2.cxd7#
  • Tries
    • 1.Qxf7?
      • threat
        • 2.Qf5#
        • 2.c7#
      • 1...Sc3
        • 2.Qf5#
      • 1...Sd2!
    • 1.c7+?
      • 1...Qd5
        • 2.Qg4#
        • 2.Qf5#
      • 1...Kf4!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Rxe3#
      • 1...Qxd7+
        • 2.cxd7#
      • 1...Kf3
        • 2.Rxe3#
      • 1...Qb3
        • 2.Qf5#
      • 1...Qd5
        • 2.Qg4#
      • 1...Qf3
        • 2.Qe6#
      • 1...Qf4
        • 2.c7#
      • 1...e2
        • 2.Re3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(h);N_PINQ(G)::QAB1(G)
    • Q(h);N_PINQ(G),SBLOCK::QAR2(G)
    • Q(h);N_GUARD,N_PINQ(G),SBLOCK::B(I)+P(E)
    • Q(h);N_PINQ(G)::QAB1(G),XQ(h)
    • Q(h);CHECK,OGATE,XQ(G)::B(I)+P(E),XQ(h)
  • Tries
    • Try
      • Q(G);N_SPINQ(G),XQ(h)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::QAB1(G)
      • Refutation
        • S(a);
    • Try
      • P(E);CHECK,N_SPINQ(G)
      • Refutation
        • K(g);P-FLIGHT
  • Actual
    • R(A);
    • Threat
      • R1(A),XP(e)
    • Vars
      • Q(h);CHECK,OGATE,XQ(G)::B(I)+P(E),XQ(h)
      • K(g);P_SPINP(e),S_FLIGHT::R1(A),XP(e)
      • Q(h);N_PINQ(G)::QAB1(G)
      • Q(h);N_PINQ(G),SBLOCK::QAR2(G)
      • Q(h);N_GUARD,N_PINQ(G),SBLOCK::B(I)+P(E)
      • P(e);::R1(A)
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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).