MESON Chess Problem Database

Problem Display
PID: 73 (7K/2Q5/1p1N1B2/b2p4/Rq2nkp1/7p/8/4RN1B w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

1st Prize, L'Italia Scacchistica, 1930/I

7K/2Q5/1p1N1B2/b2p4/Rq2nkp1/7p/8/4RN1B

#2

8 + 8

14752 Soviet Chess Compositions (1945-1947) 1947
785 Het Belgisch Schaakbord (L'Echiquier Belge) 1955
3098 FIDE Album (1914-1944) (I) 1971
273 Mat Plus 1994

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qc1#
    • 1...Sg3
      • 2.Qc1#
    • 1...Sg5
      • 2.Be5#
      • 2.Qc1#
    • 1...Sxf6
      • 2.Qc1#
    • 1...d4
      • 2.Rxe4#
  • Tries
    • 1.Qc1+?
      • 1...Sd2
        • 2.Qxd2#
      • 1...Qd2!
    • 1.Qg7?
      • threat
        • 2.Be5#
      • 1...Qxd6
        • 2.Qg5#
      • 1...Sxd6
        • 2.Qg5#
      • 1...Sxf6
        • 2.Qxf6#
        • 2.Qh6#
      • 1...Qc3
        • 2.Bg5#
        • 2.Qh6#
        • 2.Qg5#
      • 1...Qb2
        • 2.Bg5#
        • 2.Qh6#
        • 2.Qg5#
      • 1...Qd4!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Sh5#
      • 1...Kxg3
        • 2.Sxe4#
      • 1...Qxe1
        • 2.Sdf5#
      • 1...Qxd6
        • 2.Qxd6#
      • 1...Sxg3
        • 2.Qc1#
      • 1...Sxd6
        • 2.Qxd6#
      • 1...Sxf6
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • S(c);N_GUARD,P_SPINQ(b)::QAB(G)
    • S(c);N_GUARD,P_SPINQ(b),XB(F)::QAB(G)
    • P(g);N_GUARD,S_CUTQ(b)::R1(A),XS(c)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINQ(b),P_SPINS(c)::QAB(G),XS(c)
      • Refutation
        • Q(b);P_SPINQ(b),P_SPINS(c)
    • Try
      • Q(G);
      • Threat
        • B(F)
      • Vars
        • Q(b);P_SPINS(c),XS(E)::QAB1(G)
        • S(c);N_GUARD,P_SPINQ(b),XS(E)::QAB1(G)
      • Refutation
        • Q(b);
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • K(d);S_FLIGHT,XS(B)::QAB(G)+S(E),DCHECK,XS(c)
      • Q(b);N_GUARD,P_SPINS(c),XR(A)::QAB(G)+S(E)
      • Q(b);OGATE,P_SPINQ(b),P_SPINS(c),XS(E)::QAB(G),XQ(b)
      • S(c);N_GUARD,P_SPINQ(b),SBLOCK,XS(B)::QAB(G)
      • S(c);OGATE,P_SPINQ(b),P_SPINS(c),XS(E)::QAB(G),XS(c)
      • S(c);N_GUARD,P_SPINQ(b),XB(F)::QAB(G)+S(E)
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