MESON Chess Problem Database

Problem Display
PID: 259615 (4rQB1/B5n1/K2pq1N1/1P1k3p/Nb2pP2/1P2P3/8/8 w - - 0 1)

Somma, Francesco

L'Italia Scacchistica, 1925

4rQB1/B5n1/K2pq1N1/1P1k3p/Nb2pP2/1P2P3/8/8

#2

10 + 8

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Sxe7#
    • 1...Ra8
      • 2.Se7#
      • 2.Qxa8#
    • 1...Rb8
      • 2.Se7#
    • 1...Rc8
      • 2.Se7#
    • 1...Rd8
      • 2.Se7#
    • 1...Rxf8
      • 2.Se7#
    • 1...Ba3
      • 2.Sc3#
    • 1...Bc3
      • 2.Sxc3#
    • 1...Bc5
      • 2.Sc3#
    • 1...Sf5
      • 2.Qxf5#
  • Tries
    • 1.Bxe6+?
      • 1...Rxe6
        • 2.Qa8#
      • 1...Sxe6
        • 2.Qf5#
      • 1...Kxe6!
    • 1.Qxd6+?
      • 1...Bxd6
        • 2.Sc3#
      • 1...Kxd6!
    • 1.Qf7?
      • threat
        • 2.Qb7#
      • 1...Re7
        • 2.Sxe7#
      • 1...Rb8
        • 2.Se7#
      • 1...Rc8
        • 2.Se7#
      • 1...Qxf7!
  • Keys
    • 1.Bc5!
      • threat
        • 2.Qxd6#
      • 1...Ra8+
        • 2.Qxa8#
      • 1...dxc5+
        • 2.Sb6#
      • 1...Rxf8
        • 2.Se7#
      • 1...Bxc5
        • 2.Sc3#
      • 1...Re7
        • 2.Sxe7#
      • 1...Rd8
        • 2.Se7#
      • 1...Sf5
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • R(h);N_GUARD::S(G),XR(h)
    • R(h);N_GUARD::S(G)
    • R(h);N_GUARD,XQ(I)::S(G)
    • B(a);N_GUARD::S(C)
    • B(a);N_GUARD::S(C),XB(a)
    • S(g);N_GUARD::QAR2(I),XS(g)
  • Tries
    • Try
      • B(J);CHECK,XQ(f)
      • Vars
        • R(h);OGATE,SBLOCK,XB(J)::QAB(I)
        • S(g);XB(J)::QAR2(I)
      • Refutation
        • K(c);S_FLIGHT,XB(J)
    • Try
      • Q(I);CHECK,P_SPINQ(I),XP(e)
      • Vars
        • B(a);SBLOCK,XQ(I)::S(C)
      • Refutation
        • K(c);N_SPINQ(f),P-FLIGHT,XQ(I)
    • Try
      • Q(I);
      • Threat
        • QAB(I)
      • Vars
        • R(h);N_GUARD::S(G),XR(h)
        • R(h);N_GUARD::S(G)
      • Refutation
        • Q(f);XQ(I)
  • Actual
    • B(H);
    • Threat
      • QAR1(I),XP(e)
    • Vars
      • R(h);CHECK,OGATE::QAB(I),XR(h)
      • P(e);CHECK,XB(H)::S(C)
      • R(h);N_GUARD,XQ(I)::S(G)
      • B(a);N_GUARD,SBLOCK,XB(H)::S(C)
      • R(h);N_GUARD::S(G),XR(h)
      • R(h);N_GUARD::S(G)
      • S(g);N_GUARD::QAR2(I),XS(g)
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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).