MESON Chess Problem Database

Problem Display
PID: 39225 (3NbK2/6p1/7k/2R5/8/8/8/1Q6 w - - 0 1)

Stepochkin, Anatoly Viktorovich

Zog, 1987

3NbK2/6p1/7k/2R5/8/8/8/1Q6

#2

4 + 3

2786 More Fun with Chess Miniatures 2000
136 Problem Observer 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Ba4
      • 2.Sf7#
    • 1...Bb5
      • 2.Sf7#
    • 1...Bc6
      • 2.Sf7#
    • 1...Bd7
      • 2.Sf7#
    • 1...Bf7
      • 2.Sxf7#
    • 1...g6
      • 2.Qh1#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Qxg7#
      • 1...Kg6
        • 2.Qxg7#
      • 1...Kh7
        • 2.Qxg7#
      • 1...g6
        • 2.Qg7#
        • 2.Qh8#
        • 2.Qh1#
      • 1...g5!
    • 1.Qh1+?
      • 1...Bh5
        • 2.Qxh5#
      • 1...Kg6!
    • 1.Qb2?
      • threat
        • 2.Qxg7#
      • 1...Kg6
        • 2.Qxg7#
      • 1...Kh7
        • 2.Qxg7#
      • 1...g6
        • 2.Qg7#
        • 2.Qh8#
        • 2.Qh2#
      • 1...g5!
  • Keys
    • 1.Kg8!
      • threat
        • 2.Qh7#
      • 1...Bf7+
        • 2.Sxf7#
      • 1...Bg6
        • 2.Qc1#
      • 1...g6
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • B(c);N_GUARD::S(C)
    • B(c);N_GUARD::S(C),XB(c)
    • P(b);SBLOCK,S_CUTB(c)::QAR(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR1(A),XP(b)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(A),XB(c)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR1(A),XP(b)
      • Refutation
        • P(b);
  • Actual
    • K(D);P-FLIGHT
    • Threat
      • QAR1(A)
    • Vars
      • B(c);CHECK,N_GUARD::S(C),XB(c)
      • B(c);SBLOCK,S_CUTP(b)::QAB(A)
      • P(b);SBLOCK,S_CUTB(c)::QAR(A)
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