MESON Chess Problem Database

Problem Display
PID: 221789 (r3R3/p1PPrn2/B1K1kp2/3pp2Q/8/7b/8/8 w - - 0 1)

Valois, Paul Stedman

Valois Notebooks, 2020

r3R3/p1PPrn2/B1K1kp2/3pp2Q/8/7b/8/8

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rc8
      • 2.dxc8Q#
      • 2.dxc8B#
    • 1...d4
      • 2.Bc4#
    • 1...e4
      • 2.Qxd5#
    • 1...f5
      • 2.Qg6#
  • Tries
    • 1.Qg4+?
      • 1...f5
        • 2.Qg6#
      • 1...Bxg4!
    • 1.c8Q?
      • threat
        • 2.d8S#
      • 1...Rxc8+
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...Rxe8
        • 2.dxe8Q#
        • 2.dxe8R#
      • 1...f5
        • 2.Qg6#
      • 1...Sd8+!
    • 1.c8B?
      • threat
        • 2.d8S#
      • 1...Rxc8+
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...Rxe8
        • 2.dxe8Q#
        • 2.dxe8R#
      • 1...f5
        • 2.Qg6#
      • 1...Sd8+!
  • Keys
    • 1.Bc8!
      • threat
        • 2.d8S#
      • 1...Sd8+
        • 2.cxd8S#
      • 1...Rxe8
        • 2.dxe8Q#
        • 2.dxe8R#
      • 1...Rxc8
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...f5
        • 2.Qg6#

This is a version of 221788

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(i);OGATE,P_PINP(D)::PXR(i)=Q
    • P(b);OGATEB::B(B)
    • P(c);OGATE::QAB1(A),XP(b)
    • P(e);OGATEB::QAR2(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • P(e);OGATEB,P_SPINP(e)::QAR2(A)
      • Refutation
        • B(a);XQ(A)
    • Try
      • P(D);
      • Threat
        • P=S
      • Vars
        • R(i);CHECK,OGATE,XQ(D)::PXR(i)=Q
        • R(g);N_SPINR(g),OGATE,XR(F)::PXR(g)=Q
        • P(e);OGATEB::QAR2(A)
      • Refutation
        • S(h);CHECK
    • Try
      • P(D);
      • Threat
        • P=S
      • Vars
        • R(i);CHECK,OGATE,XB(D)::PXR(i)=Q
        • R(g);N_SPINR(g),OGATE,XR(F)::PXR(g)=Q
        • P(e);OGATEB::QAR2(A)
      • Refutation
        • S(h);CHECK
  • Actual
    • B(B);
    • Threat
      • P=S
    • Vars
      • S(h);CHECK,OGATE::PXS(h)=S
      • R(g);N_SPINR(g),OGATE,XR(F)::PXR(g)=Q
      • R(i);OGATE,P_PINP(D),XB(B)::PXR(i)=Q
      • P(e);OGATEB::QAR2(A)
HTML5 logo

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).