MESON Chess Problem Database

Problem Display
PID: 204404 (b5Q1/2pR4/8/1prq4/1pk5/3Rp3/4N1B1/3KN3 w - - 0 1)

Somma, Francesco

L'Alfiere di Re, 1925

b5Q1/2pR4/8/1prq4/1pk5/3Rp3/4N1B1/3KN3

#2

7 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe6
      • 2.R7d4#
    • 1...Qf7
      • 2.R7d4#
    • 1...Qxg8
      • 2.R7d4#
    • 1...Rc6
      • 2.Qxd5#
    • 1...b3
      • 2.Rd4#
  • Tries
    • 1.Kc2?
      • threat
        • 2.Rd4#
      • 1...Rc6
        • 2.Qxd5#
      • 1...b3+!
    • 1.Qg4+?
      • 1...Qd4
        • 2.R7xd4#
        • 2.Qxd4#
      • 1...Qe4!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Se5#
      • 1...Kxd3
        • 2.Se5#
      • 1...Qxg8
        • 2.R7d4#
      • 1...Rc6
        • 2.Qxd5#
      • 1...b3
        • 2.Rd4#
      • 1...Qe6
        • 2.R7d4#
      • 1...Qf7
        • 2.R7d4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(f);N_PINR(E),OGATE::R1(F)
    • Q(f);N_PINR(E),N_SPINQ(f),OGATE,XQ(G)::R1(F)
    • R(e);N_GUARD,S_CUTB(h)::QAB1(G),XQ(f)
    • P(b);SBLOCK::R1(E)
  • Tries
    • Try
      • K(A);N_SPINR(E),S_FLIGHT
      • Threat
        • R1(E)
      • Vars
        • R(e);N_GUARD,S_CUTB(h)::QAB1(G),XQ(f)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(G);CHECK,N_PINQ(f)
      • Refutation
        • Q(f);N_PINR(E),P_SPINQ(f)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • K(c);S_FLIGHT,XR(E)::S(B)
      • Q(f);N_PINR(E),N_SPINQ(f),OGATE,XQ(G)::R1(F)
      • R(e);N_GUARD,S_CUTB(h)::QAB1(G),XQ(f)
      • P(b);SBLOCK::R1(E)
      • Q(f);N_PINR(E),OGATE::R1(F)
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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).