MESON Chess Problem Database

Problem Display
PID: 264145 (8/2p1r2n/1nR2r1Q/1PNk2qR/pP1P4/b1PP3B/4p1NB/5bK1 w - - 0 1)

Gavrilov, Constantin Grigorievich

Tijdschrift vd KNSB, 1939

8/2p1r2n/1nR2r1Q/1PNk2qR/pP1P4/b1PP3B/4p1NB/5bK1

#2

13 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Se3#
    • 1...Qf5
      • 2.Sf4#
    • 1...Rxc6
      • 2.Qxc6#
  • Tries
    • 1.Se6?
      • threat
        • 2.Rc5#
      • 1...Qe5
        • 2.Se3#
        • 2.Rxe5#
      • 1...Qf5
        • 2.Se3#
        • 2.Sgf4#
        • 2.Sef4#
      • 1...Rf4
        • 2.Sxf4#
      • 1...Sd7
        • 2.Sxc7#
        • 2.c4#
      • 1...Bxb4!
    • 1.Rxg5+?
      • 1...Rf5
        • 2.Sf4#
      • 1...Re5
        • 2.Se3#
        • 2.Rxe5#
      • 1...Sxg5!
    • 1.Qxg5+?
      • 1...Rf5
        • 2.Sf4#
      • 1...Re5
        • 2.Se3#
        • 2.Qxe5#
      • 1...Sxg5!
  • Keys
    • 1.Sa6!
      • threat
        • 2.Rc5#
      • 1...Rxc6
        • 2.Qxc6#
      • 1...Bxb4
        • 2.Sxb4#
      • 1...Qe5
        • 2.Se3#
      • 1...Qf5
        • 2.Sf4#
      • 1...Re5
        • 2.Sxc7#
      • 1...Sd7
        • 2.Sxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(f);N_PINS(B)::S(B)
    • R(h);OGATE,XR(L)::QAB1(M),XR(h)
  • Tries
    • Try
      • S(J);
      • Threat
        • R1(L)
      • Vars
        • R(h);N_GUARD::S(J),XR(h)
      • Refutation
        • B(c);XP(G)
    • Try
      • R(K);CHECK,N_SPINS(B),XQ(f)
      • Vars
        • R(h);P_SPINR(h)::S(B)
      • Refutation
        • S(k);XR(K)
    • Try
      • Q(M);CHECK,N_SPINS(B),XQ(f)
      • Vars
        • R(h);P_SPINR(h)::S(B)
      • Refutation
        • S(k);P_SPINS(k),XQ(M)
  • Actual
    • S(J);
    • Threat
      • R1(L)
    • Vars
      • R(h);OGATE,XR(L)::QAB1(M),XR(h)
      • B(c);XP(G)::S(J),XB(c)
      • Q(f);N_PINS(B)::S(B)
      • R(j);N_GUARD,N_SPINQ(f)::S(J),XP(i)
      • S(g);S_CUTR(j)::S(J),XP(i)
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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).