MESON Chess Problem Database

Problem Display
PID: 198161 (1bK1R3/8/2p1Np1n/2B1kqnR/1pB2p2/p7/2Q5/7b w - - 0 1)

Ellerman, Arnoldo

2nd Prize, Western Daily Mercury, 1920

(First published on Fri Jul 16 1920)

1bK1R3/8/2p1Np1n/2B1kqnR/1pB2p2/p7/2Q5/7b

#2

7 + 11

6490 yacpdb 2019
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2
      • 2.Sd4#
      • 2.Sg7#
    • 1...Qd3
      • 2.Sd4#
      • 2.Sg7#
    • 1...Qe4
      • 2.Sd4#
      • 2.Sg7#
    • 1...Qxe6+
      • 2.Rxe6#
    • 1...Qh7
      • 2.Sg7#
    • 1...Bd6
      • 2.Bd4#
    • 1...Sf3
      • 2.Qe2#
    • 1...Sxe6
      • 2.Rxe6#
  • Tries
    • 1.Qb2+?
      • 1...Ke4
        • 2.Qe2#
      • 1...axb2!
  • Keys
    • 1.Kd7!
      • threat
        • 2.Bd4#
      • 1...Qd3+
        • 2.Sd4#
      • 1...Qxe6+
        • 2.Rxe6#
      • 1...Qh7+
        • 2.Sg7#
      • 1...Qxc2
        • 2.Sd4#
        • 2.Sg7#
      • 1...Sxe6
        • 2.Rxe6#
      • 1...Qe4
        • 2.Sd4#
        • 2.Sg7#
      • 1...Ba7
        • 2.Bd6#
      • 1...Sf3
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(f);CHECK,OGATE,P_SPINQ(f),P_SPINS(g),XS(E)::R1(G),XQ(f)
    • Q(f);N_PINS(E),P_SPINS(g)::R(G)+S(E)
    • B(k);SBLOCK::B(C)
    • S(g);N_GUARD,P_SPINQ(f),S_CUTB(a)::QAR(A)
    • S(g);OGATE,P_SPINQ(f),P_SPINS(g),XS(E)::R1(G),XS(g)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);P-FLIGHT::QAR2(A)
      • Refutation
        • P(b);XQ(A)
  • Actual
    • K(F);S_FLIGHT
    • Threat
      • B(C)
    • Vars
      • Q(f);CHECK,N_PINS(E),P_SPINS(g)::R(G)+S(E)
      • Q(f);CHECK,OGATE,P_SPINQ(f),P_SPINS(g),XS(E)::R1(G),XQ(f)
      • S(g);OGATE,P_SPINQ(f),P_SPINS(g),XS(E)::R1(G),XS(g)
      • B(k);N_GUARD::B(C)
      • S(g);N_GUARD,P_SPINQ(f),S_CUTB(a)::QAR(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).