MESON Chess Problem Database

Problem Display
PID: 202391 (2B5/1P1np1BN/qp3p2/2P4R/2pNk3/2P1p1PK/p7/1b1Qn3 w - - 0 1)

Somma, Francesco

L'Alfiere di Re, 1923

2B5/1P1np1BN/qp3p2/2P4R/2pNk3/2P1p1PK/p7/1b1Qn3

#2

11 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb7
      • 2.Bxb7#
    • 1...Qa8
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Bd3
      • 2.Qg4#
    • 1...Sd3
      • 2.Qf3#
      • 2.Qh1#
    • 1...e2
      • 2.Qxe2#
  • Tries
    • 1.Se6?
      • threat
        • 2.Qd5#
      • 1...Qxb7
        • 2.Bxb7#
      • 1...e2
        • 2.Qxe2#
      • 1...Bd3
        • 2.Qg4#
      • 1...Sd3
        • 2.Qh1#
      • 1...f5
        • 2.Seg5#
        • 2.Shg5#
      • 1...Se5!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Qd5#
      • 1...Qxb7
        • 2.Bxb7#
      • 1...e2
        • 2.Qxe2#
      • 1...e5
        • 2.Sd6#
      • 1...Bd3
        • 2.Qg4#
      • 1...Sd3
        • 2.Qh1#
      • 1...Se5
        • 2.Bf5#
      • 1...f5
        • 2.Sg5#
      • 1...e6
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • Q(g);OGATE,XP(H)::B(K),XQ(g)
    • Q(g);OGATE::PXQ(g)=Q
    • B(a);SBLOCK::QAR2(A)
    • P(d);OGATEB::QAR2(A),XP(d)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAB1(A)
      • Vars
        • Q(g);OGATE,XP(H)::B(K),XQ(g)
        • P(d);OGATEB::QAR2(A),XP(d)
        • B(a);SBLOCK::QAR2(A)
        • S(b);OGATE,SBLOCK::QAB(A)
      • Refutation
        • S(j);
  • Actual
    • S(E);
    • Threat
      • QAB1(A)
    • Vars
      • Q(g);OGATE,XP(H)::B(K),XQ(g)
      • P(d);OGATEB::QAR2(A),XP(d)
      • P(k);N_GUARD::S(E)
      • B(a);SBLOCK::QAR2(A)
      • S(b);OGATE,SBLOCK::QAB(A)
      • S(j);OGATE,SBLOCK::B(K)
      • P(i);N_GUARD,SBLOCK::S(J)
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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).