MESON Chess Problem Database

Problem Display
PID: 105371 (3BR3/R4p2/3pbNP1/2n1k1Pp/2B1Pp1K/2P2p2/8/7Q w - - 0 1)

Erokhin, Vladimir Alekseevich

Pfeiffer MT, 1980

3BR3/R4p2/3pbNP1/2n1k1Pp/2B1Pp1K/2P2p2/8/7Q

#2

11 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Bc7#
  • Tries
    • 1.Rxf7?
      • 1...Sxe4
        • 2.Sd7#
      • 1...d5
        • 2.Bc7#
      • 1...Sb3
        • 2.Rxe6#
      • 1...Sd3
        • 2.Rxe6#
      • 1...Sa4
        • 2.Rxe6#
      • 1...Sa6
        • 2.Rxe6#
      • 1...Sb7
        • 2.Rxe6#
      • 1...Sd7
        • 2.Rxe6#
      • 1...f2!
    • 1.Qxf3?
      • 1...Sxe4
        • 2.Qxe4#
      • 1...d5
        • 2.Bc7#
      • 1...Sb3
        • 2.Sd7#
      • 1...Sd3
        • 2.Sd7#
      • 1...Sa4
        • 2.Sd7#
      • 1...Sa6
        • 2.Sd7#
      • 1...Sb7
        • 2.Sd7#
      • 1...Sd7
        • 2.Sxd7#
      • 1...fxg6!
    • 1.Qd1?
      • threat
        • 2.Qd4#
        • 2.Qd5#
      • 1...Sxe4
        • 2.Qd5#
      • 1...d5
        • 2.Bc7#
        • 2.Qxd5#
      • 1...Sb3
        • 2.Qd5#
      • 1...Sd3!
    • 1.Qh3?
      • threat
        • 2.Qf5#
      • 1...Sxe4
        • 2.Sd7#
      • 1...d5
        • 2.Bc7#
      • 1...fxg6!
  • Keys
    • 1.Ra5!
      • 1...fxg6
        • 2.Rxe6#
      • 1...d5
        • 2.Bc7#
      • 1...f2
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(f);OGATEB::B(J)
  • Tries
    • Try
      • R(I);XP(h)
      • Vars
        • S(c);N_GUARD,SBLOCK,XP(D)::S(G)
        • P(f);OGATEB::B(J)
        • S(c);N_GUARD::R1(K),XB(g)
      • Refutation
        • P(a);
    • Try
      • Q(A);XP(a)
      • Vars
        • S(c);OGATE,XP(D)::QAR1(A),XS(c)
        • P(f);OGATEB::B(J)
        • S(c);N_GUARD::S(G)
        • S(c);N_GUARD::S(G),XS(c)
      • Refutation
        • P(h);XP(H)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);XP(D)::QAR1(A)
        • S(c);::QAR1(A)
      • Refutation
        • S(c);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(c);N_GUARD,SBLOCK,XP(D)::S(G)
        • P(f);OGATEB::B(J)
      • Refutation
        • P(h);XP(H)
  • Actual
    • R(I);P_PINS(c)
    • Vars
      • P(h);N_GUARD,XP(H)::R1(K),XB(g)
      • P(f);N_SPINS(c),OGATEB::B(J)
      • P(a);::S(G)
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