MESON Chess Problem Database

Problem Display
PID: 85281 (6b1/8/3B4/r4pN1/P2k2Pp/1p1pN3/3Kn3/7Q w - - 0 1)

Ivunin, Alexey Vsevolodovich

Na Smenu!, 1966

6b1/8/3B4/r4pN1/P2k2Pp/1p1pN3/3Kn3/7Q

#2

7 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be6
      • 2.Sxe6#
    • 1...Bh7
      • 2.Se6#
    • 1...fxg4
      • 2.Qe4#
    • 1...f4
      • 2.Qe4#
  • Tries
    • 1.Sxf5+?
      • 1...Rxf5
        • 2.Qe4#
      • 1...Kc4!
    • 1.Qb7?
      • threat
        • 2.Sf3#
      • 1...fxg4
        • 2.Qe4#
      • 1...Rd5
        • 2.Qb4#
      • 1...Bd5
        • 2.Qg7#
      • 1...Sg1!
    • 1.Qa1+?
      • 1...Sc3
        • 2.Qxc3#
      • 1...b2!
    • 1.Qb1?
      • threat
        • 2.Qxd3#
      • 1...Sc1
        • 2.Qb2#
      • 1...Sf4
        • 2.Qb2#
      • 1...Bc4!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Sf3#
      • 1...fxg4
        • 2.Qe4#
      • 1...Rd5
        • 2.Qc4#
      • 1...Bd5
        • 2.Sxf5#
      • 1...Sg1
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • B(h);N_GUARD::S(F),XB(h)
    • B(h);N_GUARD::S(F)
    • P(g);N_GUARD,XP(E)::QAR1(A)
    • P(g);N_GUARD::QAR1(A)
  • Tries
    • Try
      • S(C);CHECK,XP(g)
      • Vars
        • R(f);XS(C)::QAR1(A)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • S(F)
      • Vars
        • P(g);N_GUARD,XP(E)::QAR1(A)
        • R(f);S_CUTB(h)::QAR2(A)
        • B(h);S_CUTR(f)::QAB(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(c)
      • Vars
        • S(a);N_GUARD::QAB(A)
      • Refutation
        • B(h);
  • Actual
    • Q(A);
    • Threat
      • S(F)
    • Vars
      • P(g);N_GUARD,XP(E)::QAR1(A)
      • R(f);S_CUTB(h)::QAR1(A)
      • B(h);S_CUTR(f)::S(C),XP(g)
      • S(a);N_GUARD::QAB1(A)
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