MESON Chess Problem Database

Problem Display
PID: 162079 (1b2n3/1B1pRp2/1p1Q4/4P1P1/3p2K1/4k1p1/1nR3p1/4N3 w - - 0 1)

Neiman, Moisei Borisovich

Pravda, 1926

1b2n3/1B1pRp2/1p1Q4/4P1P1/3p2K1/4k1p1/1nR3p1/4N3

#2

8 + 10

5007 Zadachi i Etyudi 1928

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd6
      • 2.exd6#
    • 1...Sd3
      • 2.Sxg2#
    • 1...Sxd6
      • 2.exd6#
    • 1...Sf6+
      • 2.exf6#
    • 1...d3
      • 2.Sxg2#
      • 2.Qxb6#
    • 1...f5+
      • 2.exf5 ep#
    • 1...f6
      • 2.exf6#
  • Tries
    • 1.Bf3?
      • threat
        • 2.Re2#
      • 1...Sf6+
        • 2.exf6#
      • 1...f5+
        • 2.exf5 ep#
      • 1...d3
        • 2.Sxg2#
        • 2.Qxb6#
      • 1...g1S!
    • 1.Qa3+?
      • 1...Sd3
        • 2.Sxg2#
        • 2.Qxd3#
      • 1...d3!
    • 1.Qf6?
      • threat
        • 2.Qf3#
        • 2.Qf4#
      • 1...d3
        • 2.Qf4#
        • 2.Qxb6#
      • 1...g1S
        • 2.Qf4#
      • 1...Sd3
        • 2.Sxg2#
        • 2.Qf3#
      • 1...Sxf6+!
  • Keys
    • 1.Qh6!
      • threat
        • 2.g6#
      • 1...Sf6+
        • 2.gxf6#
      • 1...f5+
        • 2.gxf5 ep#
      • 1...d3
        • 2.Qxb6#
      • 1...d5
        • 2.exd5 ep#
      • 1...Sd3
        • 2.Sxg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(i);OGATE,XQ(F)::R(H)+P(D),XB(i)
    • S(a);SBLOCK::S(A),XP(b)
    • S(j);OGATE,XQ(F)::R(H)+P(D),XS(j)
    • S(j);CHECK,OGATE::R(H)+P(D),XS(j)
    • P(h);CHECK,OGATE::R(H)+P(D),XP(h),EP
    • P(h);OGATE::R(H)+P(D),XP(h)
  • Tries
    • Try
      • B(G);
      • Threat
        • R1(B)
      • Vars
        • S(j);CHECK,OGATE::R(H)+P(D),XS(j)
        • P(h);CHECK,OGATE::R(H)+P(D),XP(h),EP
      • Refutation
        • P(b);
    • Try
      • Q(F);CHECK
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAB1(F)
      • Refutation
        • S(j);CHECK,XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAB(F)+P(E)
    • Vars
      • S(j);CHECK,OGATE::QAB(F)+P(E),XS(j)
      • P(h);CHECK,OGATE::QAB(F)+P(E),XP(h),EP
      • P(e);OGATEB::QAB(F),XP(f)
      • P(g);OGATE::R(H)+P(D),XP(g),EP
      • S(a);SBLOCK::S(A),XP(b)
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