MESON Chess Problem Database

Problem Display
PID: 6356 (4BB2/7K/R6p/3PpN2/1Pk4r/2q2NR1/P2Q4/b3n3 w - - 0 1)

Isaev, Leonid Antonovich

Zadachi i Etyudi, 1928

4BB2/7K/R6p/3PpN2/1Pk4r/2q2NR1/P2Q4/b3n3

#2

11 + 7

815 Revista de Sah 1951
5395 Schach fur Nussknacker 1994
23 Die Schwalbe 2007
56 The Problemist 2007
136 Problem Observer 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Se3#
      • 2.Sd6#
    • 1...Qxb4
      • 2.Se3#
    • 1...Qc1
      • 2.Se3#
      • 2.Sd6#
    • 1...Qa3
      • 2.Sd6#
    • 1...Qb3
      • 2.Sd6#
    • 1...Qe3
      • 2.Sxe3#
      • 2.Sd6#
    • 1...Qxf3
      • 2.Sd6#
    • 1...Sd3
      • 2.Se3#
  • Tries
    • 1.Qe2+?
      • 1...Kxd5
        • 2.Se7#
        • 2.Bf7#
        • 2.Rd6#
      • 1...Sd3
        • 2.Se3#
      • 1...Qd3!
  • Keys
    • 1.Ra5!
      • threat
        • 2.Bb5#
      • 1...Qxd2
        • 2.Sxd2#
      • 1...Qxb4
        • 2.Se3#
      • 1...Qd4
        • 2.Sd6#
      • 1...Qd3
        • 2.Rc5#
      • 1...Rd4
        • 2.Sxe5#
      • 1...Sd3
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_GUARD,XP(E)::S(G)
    • Q(c);::S(G)
    • Q(c);XS(C)::S(G)
    • S(b);S_CUTQ(c)::S(G)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(b);P_SPINS(b)::S(G)
      • Refutation
        • Q(c);P_PINS(G),P_SPINQ(c)
  • Actual
    • R(H);
    • Threat
      • B(J)
    • Vars
      • Q(c);XQ(B)::S(C),XQ(c)
      • Q(c);N_GUARD,XP(E)::S(G)
      • Q(c);::S(G)
      • Q(c);P_PINS(G)::R1(H)
      • R(e);S_CUTQ(c)::S(C),XP(f)
      • S(b);S_CUTQ(c)::S(G)
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