MESON Chess Problem Database

Problem Display
PID: 85559 (3R3b/2n1Br1q/8/RbN1k1p1/4p1B1/4P1N1/5P1Q/1K6 w - - 0 1)

Petrov, Evgeny Aleksandrovich

Canadian Chess Chat, 1981

3R3b/2n1Br1q/8/RbN1k1p1/4p1B1/4P1N1/5P1Q/1K6

#2

10 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Sxf5#
    • 1...Qg6
      • 2.Sf5#
    • 1...Qg8
      • 2.Sf5#
    • 1...Qg7
      • 2.Sf5#
    • 1...Rxe7
      • 2.Sh5#
    • 1...Rg7
      • 2.Sh5#
    • 1...Bf1
      • 2.Sd3#
      • 2.Sd7#
    • 1...Be2
      • 2.Sd3#
      • 2.Sd7#
    • 1...Bd3+
      • 2.Sxd3#
    • 1...Ba4
      • 2.Sd3#
      • 2.Sd7#
    • 1...Bc4
      • 2.Sd3#
      • 2.Sd7#
    • 1...Ba6
      • 2.Sd3#
      • 2.Sd7#
    • 1...Bc6
      • 2.Sd3#
      • 2.Sd7#
    • 1...Bd7
      • 2.Sd3#
      • 2.Sxd7#
    • 1...Be8
      • 2.Sd3#
      • 2.Sd7#
    • 1...Bf6
      • 2.Sh5#
  • Tries
    • 1.f4+?
      • 1...Rxf4
        • 2.Qb2#
      • 1...gxf4
        • 2.Qb2#
      • 1...exf4 ep+!
  • Keys
    • 1.Rd6!
      • threat
        • 2.Sd7#
      • 1...Bd3+
        • 2.Sxd3#
      • 1...Rxe7
        • 2.Sh5#
      • 1...Qf5
        • 2.Sxf5#
      • 1...Bd7
        • 2.Sd3#
        • 2.Sxd7#
      • 1...Sd5
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_GUARD::QAB(C)+S(E),XQ(g)
    • Q(g);N_GUARD::QAB(C)+S(E)
    • R(f);N_GUARD,XB(I)::QAB(C)+S(E)
    • R(f);N_GUARD::QAB(C)+S(E)
    • B(b);CHECK::R(G)+S(H),DCHECK,XB(b)
    • B(h);S_CUTR(f)::QAB(C)+S(E)
  • Tries
    • Try
      • P(B);CHECK
      • Vars
        • R(f);XP(B)::QAB(C)
        • P(d);XP(B)::QAB(C)
      • Refutation
        • P(a);CHECK,EP,XP(B)
  • Actual
    • R(J);
    • Threat
      • S(H)
    • Vars
      • B(b);CHECK::R(G)+S(H),DCHECK,XB(b)
      • R(f);N_GUARD,XB(I)::QAB(C)+S(E)
      • Q(g);N_GUARD::QAB(C)+S(E),XQ(g)
      • S(e);N_GUARD,SBLOCK::R1(J)
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