MESON Chess Problem Database

Problem Display
PID: 87556 (4N3/4pB1p/r4B2/1q3k2/2r5/4Qp1P/8/3R3K w - - 0 1)

Ivanovsky, Nikolai Aleksandrovich

Buletin Problemistic, 1973

4N3/4pB1p/r4B2/1q3k2/2r5/4Qp1P/8/3R3K

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Qe5#
    • 1...Qc6
      • 2.Qe5#
    • 1...Qd7
      • 2.Qe5#
    • 1...Qxe8
      • 2.Qe5#
    • 1...Qb1
      • 2.Qe5#
    • 1...Qb3
      • 2.Qe5#
    • 1...Qb4
      • 2.Qe5#
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qb6
      • 2.Qe5#
    • 1...Qb7
      • 2.Qe5#
    • 1...Rc1
      • 2.Qxf3#
    • 1...Rc2
      • 2.Qxf3#
    • 1...Re4
      • 2.Qg5#
    • 1...Rc5
      • 2.Qxf3#
    • 1...Rcc6
      • 2.Qxf3#
    • 1...Rc7
      • 2.Qxf3#
    • 1...Rc8
      • 2.Qxf3#
    • 1...Rxf6
      • 2.Sg7#
    • 1...exf6
      • 2.Sg7#
  • Tries
    • 1.Rd5+?
      • 1...e5
        • 2.Qxe5#
      • 1...Qxd5!
  • Keys
    • 1.Rg1!
      • threat
        • 2.Rg5#
      • 1...Qxe8
        • 2.Qe5#
      • 1...exf6
        • 2.Sg7#
      • 1...Qb1
        • 2.Qe5#
      • 1...Rc1
        • 2.Qxf3#
      • 1...Rg4
        • 2.hxg4#
      • 1...Ra1
        • 2.Be6#
      • 1...h6
        • 2.Bg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 15
  • Sets
    • Q(c);N_GUARD::QAR1(C)
    • Q(c);N_GUARD,XS(G)::QAR1(C)
    • Q(c);N_GUARD,P_PINR(A)::QAR1(C)
    • Q(c);N_GUARD::QAR1(C),XQ(c)
    • R(b);N_GUARD,P_PINR(A)::QAR2(C),XP(a)
    • R(b);N_GUARD::QAR2(C),XP(a)
    • R(b);SBLOCK::QAR1(C)
    • R(e);SBLOCK,XB(E)::S(G)
    • P(f);SBLOCK,XB(E)::S(G)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • P(f);P_SPINP(f)::QAR1(C),XP(f)
      • Refutation
        • Q(c);XR(A)
  • Actual
    • R(A);
    • Threat
      • R1(A)
    • Vars
      • Q(c);N_GUARD,XS(G)::QAR1(C)
      • P(f);SBLOCK,XB(E)::S(G)
      • Q(c);N_GUARD,P_PINR(A)::QAR1(C)
      • R(b);N_GUARD,P_PINR(A)::QAR2(C),XP(a)
      • R(b);OGATE::P(D),XR(b)
      • R(e);N_GUARD,P_PINR(A)::B(F)
      • P(g);N_GUARD::B(F)
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