MESON Chess Problem Database

Problem Display
PID: 261877 (b1q2R2/3B1NpQ/3PPk2/p1p2rN1/4pp1P/1P5r/KR4P1/B5b1 w - - 0 1)

Somma, Francesco

L'Echiquier, 1927

b1q2R2/3B1NpQ/3PPk2/p1p2rN1/4pp1P/1P5r/KR4P1/B5b1

#2

13 + 11

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Sxe4#
    • 1...Re5
      • 2.Sd8#
    • 1...Rxg5
      • 2.hxg5#
    • 1...g6
      • 2.Qh8#
  • Tries
    • 1.Se5+?
      • 1...Qxf8
        • 2.Sg4#
      • 1...Kxe5!
    • 1.Sh6+?
      • 1...Qxf8
        • 2.Sg4#
        • 2.Qxf5#
      • 1...Ke5!
    • 1.Rf2+?
      • 1...Re5
        • 2.Sd8#
        • 2.Bxe5#
        • 2.Rxf4#
      • 1...Rc3!
    • 1.Qh5?
      • threat
        • 2.Sh7#
      • 1...Rxg5
        • 2.Qxg5#
      • 1...g6
        • 2.Qh8#
      • 1...Qxd7!
    • 1.Qh6+?
      • 1...g6
        • 2.Sh7#
        • 2.Qh8#
      • 1...gxh6!
    • 1.e7?
      • threat
        • 2.Qxf5#
      • 1...Rxg5
        • 2.hxg5#
      • 1...Rd5
        • 2.Sxe4#
      • 1...Re5
        • 2.Sd8#
      • 1...g6
        • 2.Qh8#
      • 1...Qxd7!
  • Keys
    • 1.g4!
      • threat
        • 2.Qxf5#
      • 1...Rxg5
        • 2.hxg5#
      • 1...fxg4 ep
        • 2.Rf2#
      • 1...Rd5
        • 2.Sxe4#
      • 1...Re5
        • 2.Sd8#
      • 1...g6
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(g);S_CUTB(j)::S(G),XP(c)
    • R(g);SBLOCK::R(M)+S(K)
    • R(g);OGATE,XS(G)::P(F),XR(g)
    • P(i);OGATEB,SBLOCK::QAB(L)
  • Tries
    • Try
      • S(K);CHECK
      • Vars
        • Q(k);XR(M)::S(K)
      • Refutation
        • K(h);S_FLIGHT,XS(K)
    • Try
      • S(K);CHECK
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • R(C);CHECK
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • Q(L);
      • Threat
        • S(G)
      • Vars
        • R(g);OGATE,XS(G)::QAB1(L),XR(g)
        • P(i);OGATEB,SBLOCK::QAB(L)
      • Refutation
        • Q(k);XB(J)
    • Try
      • Q(L);CHECK
      • Refutation
        • P(i);XQ(L)
    • Try
      • P(I);
      • Threat
        • QAR1(L),XR(g)
      • Vars
        • R(g);OGATE,XS(G)::P(F),XR(g)
        • R(g);S_CUTB(j)::S(G),XP(c)
        • R(g);SBLOCK::R(M)+S(K)
        • P(i);OGATEB,SBLOCK::QAB(L)
      • Refutation
        • Q(k);XB(J)
  • Actual
    • P(D);
    • Threat
      • QAR1(L),XR(g)
    • Vars
      • R(g);OGATE,XS(G)::P(F),XR(g)
      • P(d);EP,S_CUTR(b),S_CUTR(g),XP(D)::B(A)+R(C)
      • R(g);S_CUTB(j)::S(G),XP(c)
      • R(g);SBLOCK::R(M)+S(K)
      • P(i);OGATEB,SBLOCK::QAB(L)
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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).