MESON Chess Problem Database

Problem Display
PID: 227532 (8/1n1p1NB1/R6p/1RPk2pQ/p7/1P6/7n/1BKN2qb w - - 0 1)

Ellerman, Arnoldo

3rd Prize, L'Italia Scacchistica, 1926

8/1n1p1NB1/R6p/1RPk2pQ/p7/1P6/7n/1BKN2qb

#2

10 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Sc3#
    • 1...Qe3+
      • 2.Sxe3#
    • 1...Qxc5+
      • 2.Sc3#
    • 1...Qxd1+
      • 2.Qxd1#
    • 1...Qg2
      • 2.Sc3#
      • 2.Se3#
    • 1...Qg4
      • 2.Sc3#
      • 2.Se3#
    • 1...Sf1
      • 2.Sc3#
    • 1...Sa5
      • 2.Rd6#
    • 1...Sxc5
      • 2.Rd6#
    • 1...Sd6
      • 2.Rxd6#
    • 1...Sd8
      • 2.Rd6#
  • Keys
    • 1.Sxg5!
      • threat
        • 2.Qf7#
      • 1...Qe3+
        • 2.Sxe3#
      • 1...Qxc5+
        • 2.Sc3#
      • 1...Qxd1+
        • 2.Qxd1#
      • 1...Qxg5+
        • 2.Se3#
      • 1...Qf2
        • 2.Sc3#
        • 2.Sf3#
      • 1...Qe1
        • 2.Se4#
      • 1...Qf1
        • 2.Sf3#
      • 1...Qg4
        • 2.Sc3#
        • 2.Se3#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sd8
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(a);N_PINS(C)::S(C)
    • Q(a);CHECK,N_PINS(C)::S(C),XQ(a)
    • Q(a);CHECK,N_PINS(C),P_SPINQ(a),XP(F)::S(C)
    • Q(a);CHECK,OGATE,XS(C)::QAR(G),XQ(a)
    • S(c);N_PINS(C)::S(C)
    • S(h);N_GUARD::R1(H)
    • S(h);N_GUARD,P_SPINS(h),XP(F)::R1(H)
    • S(h);N_GUARD::R1(H),XS(h)
  • Actual
    • S(I);XP(f)
    • Threat
      • QAB(G)
    • Vars
      • Q(a);CHECK,N_PINS(C)::S(C),XQ(a)
      • Q(a);CHECK,N_PINS(C),P_SPINQ(a),XP(F)::S(C)
      • Q(a);CHECK,OGATE,XS(C)::QAR(G),XQ(a)
      • Q(a);CHECK,N_PINS(C),P_SPINQ(a),XS(I)::S(C)
      • Q(a);N_GUARD::QAR(G)+S(I)
      • S(h);N_GUARD::R1(H),XS(h)
      • S(h);N_GUARD::R1(H)
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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).