MESON Chess Problem Database

Problem Display
PID: 162078 (1b2n3/4Rp2/1p1Q4/4P1P1/3p2K1/4k1p1/1nR2NB1/8 w - - 0 1)

Neiman, Moisei Borisovich

Zadachi i Etyudi, 1928

1b2n3/4Rp2/1p1Q4/4P1P1/3p2K1/4k1p1/1nR2NB1/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd6
      • 2.exd6#
    • 1...Sd3
      • 2.Sd1#
    • 1...Sxd6
      • 2.exd6#
    • 1...Sf6+
      • 2.exf6#
    • 1...d3
      • 2.Qxb6#
    • 1...f5+
      • 2.exf5 ep#
    • 1...f6
      • 2.exf6#
  • Tries
    • 1.Bf1?
      • threat
        • 2.Re2#
      • 1...Sf6+
        • 2.exf6#
      • 1...f5+
        • 2.exf5 ep#
      • 1...d3
        • 2.Qxb6#
      • 1...gxf2!
    • 1.Bf3?
      • threat
        • 2.Re2#
      • 1...Sf6+
        • 2.exf6#
      • 1...f5+
        • 2.exf5 ep#
      • 1...d3
        • 2.Qxb6#
      • 1...gxf2!
    • 1.Qa3+?
      • 1...Sd3
        • 2.Sd1#
        • 2.Qxd3#
      • 1...d3!
    • 1.Qf6?
      • threat
        • 2.Qf3#
        • 2.Qf4#
      • 1...gxf2
        • 2.Qf3#
      • 1...d3
        • 2.Qf4#
        • 2.Qxb6#
      • 1...Sd3
        • 2.Sd1#
        • 2.Qf3#
      • 1...Sxf6+!
  • Keys
    • 1.Qh6!
      • threat
        • 2.g6#
      • 1...Sf6+
        • 2.gxf6#
      • 1...f5+
        • 2.gxf5 ep#
      • 1...gxf2
        • 2.Qh3#
      • 1...d3
        • 2.Qxb6#
      • 1...Sd3
        • 2.Sd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(g);OGATE,XQ(G)::R(H)+P(E),XB(g)
    • S(a);N_GUARD,SBLOCK::S(B)
    • S(h);OGATE,XQ(G)::R(H)+P(E),XS(h)
    • S(h);CHECK,OGATE::R(H)+P(E),XS(h)
    • P(d);OGATEB::QAB(G),XP(e)
    • P(f);CHECK,OGATE::R(H)+P(E),XP(f),EP
    • P(f);OGATE::R(H)+P(E),XP(f)
  • Tries
    • Try
      • B(C);
      • Threat
        • R1(A)
      • Vars
        • S(h);CHECK,OGATE::R(H)+P(E),XS(h)
        • P(f);CHECK,OGATE::R(H)+P(E),XP(f),EP
        • P(d);OGATEB::QAB(G),XP(e)
      • Refutation
        • P(c);XS(B)
    • Try
      • B(C);
      • Threat
        • R1(A)
      • Vars
        • S(h);CHECK,OGATE::R(H)+P(E),XS(h)
        • P(f);CHECK,OGATE::R(H)+P(E),XP(f),EP
        • P(d);OGATEB::QAB(G),XP(e)
      • Refutation
        • P(c);XS(B)
    • Try
      • Q(G);CHECK
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);XS(B)::QAR1(G)
      • Refutation
        • S(h);CHECK,XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAB(G)+P(F)
    • Vars
      • S(h);CHECK,OGATE::QAB(G)+P(F),XS(h)
      • P(f);CHECK,OGATE::QAB(G)+P(F),XP(f),EP
      • P(c);OGATEB,XS(B)::QAR(G)
      • P(d);OGATEB::QAB(G),XP(e)
      • S(a);N_GUARD,SBLOCK::S(B)
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