MESON Chess Problem Database

Problem Display
PID: 206555 (2rN4/2P1p3/2P4N/p3k1P1/P1K5/3PP3/8/1Q6 w - - 0 1)

Grunfeld, Max

L'Alfiere di Re, 1925

2rN4/2P1p3/2P4N/p3k1P1/P1K5/3PP3/8/1Q6

#2

10 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.cxb8Q#
      • 2.cxb8B#
    • 1...e6
      • 2.Sdf7#
  • Tries
    • 1.Kc5?
      • threat
        • 2.Qa1#
        • 2.Qb2#
        • 2.d4#
      • 1...Rb8
        • 2.d4#
        • 2.cxb8Q#
        • 2.cxb8B#
      • 1...Rxd8!
    • 1.Qb4?
      • threat
        • 2.Qc5#
        • 2.Qxe7#
      • 1...Rxc7
        • 2.Qc5#
      • 1...Rxd8
        • 2.Qxe7#
      • 1...e6
        • 2.Sdf7#
        • 2.Qc5#
      • 1...axb4!
    • 1.Qb6?
      • threat
        • 2.Qd4#
        • 2.Qc5#
      • 1...Kd6
        • 2.Shf7#
      • 1...Rxd8!
  • Keys
    • 1.Qb8!
      • 1...Kd6
        • 2.Shf7#
      • 1...Rxc7
        • 2.Qxc7#
      • 1...Rxb8
        • 2.cxb8Q#
        • 2.cxb8B#
      • 1...Rxd8
        • 2.cxd8S#
      • 1...e6
        • 2.Sdf7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(d);OGATE::PXR(d)=Q
    • P(c);SBLOCK::S(J)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Threat
        • DUALS(3)
      • Refutation
        • R(d);XS(J)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(d);P_PINP(G),XP(I)::QAR2(A)
        • R(d);XS(J)::QAR2(A),XP(c)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);S_FLIGHT::S(H)
      • Refutation
        • R(d);XS(J)
  • Actual
    • Q(A);
    • Vars
      • K(b);S_FLIGHT::S(H)
      • R(d);OGATE,P_PINP(G),P_SPINR(d),XP(I)::QAB(A),XR(d)
      • R(d);OGATE,XQ(A)::PXR(d)=Q
      • R(d);OGATE,XS(J)::PXR(d)=S
      • P(c);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).