MESON Chess Problem Database

Problem Display
PID: 250150 (1R2B3/2p2Pbq/p2p2br/2kp2N1/1R1p3p/4r3/p1N1PB2/K1Q5 w - - 0 1)

Grigoriev, K

1st HM., 64 Shakhmatnoe obozrenie, 1927

1R2B3/2p2Pbq/p2p2br/2kp2N1/1R1p3p/4r3/p1N1PB2/K1Q5

#2

10 + 13

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra3
      • 2.Se6#
    • 1...Rb3
      • 2.Se6#
    • 1...Rc3
      • 2.Se6#
    • 1...Rd3
      • 2.Se6#
    • 1...Rf3
      • 2.Se6#
    • 1...Rg3
      • 2.Se6#
    • 1...Rh3
      • 2.Se6#
    • 1...Re4
      • 2.Se1#
      • 2.Sa3#
      • 2.Se3#
      • 2.Sxd4#
    • 1...Re5
      • 2.Bxd4#
    • 1...Re6
      • 2.Sxe6#
    • 1...Be5
      • 2.Se6#
    • 1...d3+
      • 2.Sd4#
    • 1...a5
      • 2.R8b5#
  • Tries
    • 1.Se1+?
      • 1...Rc3
        • 2.Se6#
        • 2.Qxc3#
      • 1...Bc2!
    • 1.Sa3+?
      • 1...Rc3
        • 2.Se6#
        • 2.Qxc3#
      • 1...Bc2!
    • 1.Sxd4+?
      • 1...Rc3
        • 2.Sb3#
        • 2.Sde6#
        • 2.Sge6#
        • 2.Qxc3#
      • 1...Bc2!
    • 1.Se4+?
      • 1...Rxe4
        • 2.Se1#
        • 2.Sa3#
        • 2.Se3#
        • 2.Sxd4#
      • 1...dxe4
        • 2.Sxe3#
      • 1...Bxe4!
    • 1.Rc4+?
      • 1...Kxc4
        • 2.Sa3#
        • 2.Sxe3#
      • 1...dxc4!
    • 1.R4b5+?
      • 1...Kc4
        • 2.Sa3#
        • 2.Sxe3#
      • 1...axb5!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qa5#
      • 1...d3+
        • 2.Rd4#
      • 1...Rxa3
        • 2.Se6#
      • 1...Rxe8
        • 2.Qc3#
      • 1...Bd3
        • 2.Ra4#
        • 2.Rxd4#
      • 1...a5
        • 2.R8b5#
        • 2.Qxa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • R(b);N_GUARD,P_SPINP(c)::S(G)
    • R(b);OGATE,P_SPINP(c)::B(E),XP(c)
    • R(b);N_GUARD,P_SPINP(c)::S(G),XR(b)
    • B(l);S_CUTR(b)::S(G)
    • P(c);CHECK,P_SPINR(b),S_CUTB(i)::QAR(B)+S(C)
    • P(g);N_GUARD::R1(I)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • B(i);P_SPINB(i)
    • Try
      • S(C);CHECK
      • Refutation
        • B(i);P_SPINB(i)
    • Try
      • S(C);CHECK,P_SPINS(C),XP(c)
      • Refutation
        • B(i);P_SPINB(i)
    • Try
      • S(G);CHECK
      • Vars
        • P(f);XS(G)::QAR(B)+S(C),XR(b)
      • Refutation
        • B(i);XS(G)
    • Try
      • R(F);CHECK
      • Refutation
        • P(f);XR(F)
    • Try
      • R(F);CHECK
      • Refutation
        • P(g);XR(F)
  • Actual
    • Q(B);
    • Threat
      • QAR2(B)
    • Vars
      • P(c);CHECK,P_SPINR(b)::QAB(B)+R(F)
      • R(b);N_GUARD,P_SPINP(c),XQ(B)::S(G)
      • R(b);N_GUARD,P_SPINP(c),XB(J)::QAR2(B)
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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).