MESON Chess Problem Database

Problem Display
PID: 202392 (2K5/5P2/2R5/5p1N/Q1q1kP2/1nP1p3/3nP3/3r4 w - - 0 1)

Somma, Francesco

L'Alfiere di Re, 1923

2K5/5P2/2R5/5p1N/Q1q1kP2/1nP1p3/3nP3/3r4

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Sf6#
  • Tries
    • 1.Rxc4+?
      • 1...Kd5
        • 2.Qc6#
      • 1...Sd4
        • 2.Rxd4#
        • 2.Qc6#
        • 2.Qa8#
      • 1...Sxc4!
    • 1.Qxc4+?
      • 1...Sd4
        • 2.Re6#
        • 2.Qxd4#
      • 1...Sxc4!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Rxc4#
      • 1...Qa6+
        • 2.Rxa6#
      • 1...Qe6+
        • 2.Rxe6#
      • 1...Qxc6+
        • 2.Qxc6#
      • 1...Kd5
        • 2.Sf6#
      • 1...Qxe2
        • 2.Rd6#
      • 1...Qxf7
        • 2.Rc4#
        • 2.Re6#
      • 1...Qxc3
        • 2.Rc4#
      • 1...Qd3
        • 2.Rc4#
        • 2.Re6#
      • 1...Qb5
        • 2.Rc4#
        • 2.Re6#
      • 1...Qd5
        • 2.Re6#
      • 1...Qa4
        • 2.Rc4#
        • 2.Re6#
      • 1...Qb4
        • 2.Rc4#
        • 2.Rb6#
        • 2.Re6#
      • 1...Qd4
        • 2.Rc4#
        • 2.Re6#
      • 1...Qc5
        • 2.Rxc5#
      • 1...Sc5
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(f);N_SPINQ(e),S_FLIGHT::S(E)
  • Tries
    • Try
      • R(F);CHECK,N_SPINR(F),XQ(e)
      • Vars
        • K(f);S_FLIGHT::QAB1(C)
      • Refutation
        • S(b);P_SPINS(b),XR(F)
    • Try
      • Q(C);CHECK,N_SPINR(F),XQ(e)
      • Refutation
        • S(b);XQ(C)
  • Actual
    • Q(C);N_PINQ(e)
    • Threat
      • QAB(C)+R(F),DCHECK,XQ(e)
    • Vars
      • Q(e);CHECK,N_PINR(F)::QAB(C)+R(F),XQ(e)
      • Q(e);CHECK,N_PINR(F)::QAB(C)+R(F),DCHECK,XQ(e)
      • Q(e);CHECK,OGATE,P_SPINQ(e),XR(F)::QAB(C),XQ(e)
      • K(f);S_FLIGHT::S(E)
      • Q(e);N_PINR(F),XP(A)::QAB(C)+R(F)
      • Q(e);XP(B)::QAB(C)+R(F),DCHECK
      • Q(e);N_PINR(F)::R(F)
      • Q(e);N_GUARD::QAB(C)+R(F),XQ(e)
      • S(c);N_PINR(F)::QAB(C)+R(F),DCHECK
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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).