MESON Chess Problem Database

Problem Display
PID: 11652 (2N5/8/B7/2k4K/1Nr3p1/B7/7b/3Q3b w - - 0 1)

Tanic, Zivota

2nd Prize, Problem TT, 1970

2N5/8/B7/2k4K/1Nr3p1/B7/7b/3Q3b

#2

6 + 5

3310 2345 Chess Problems 1997
136 Problem Observer 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Qd5#
    • 1...Rf4
      • 2.Qd6#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Bg1
      • 2.Qd6#
    • 1...Bd6
      • 2.Qxd6#
    • 1...g3
      • 2.Qd6#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Sd3#
        • 2.Qa7#
      • 1...Bd5
        • 2.Qxd5#
        • 2.Qa7#
      • 1...Bd6
        • 2.Qxd6#
        • 2.Qa7#
      • 1...Bb7
        • 2.Sd3#
      • 1...Bc7
        • 2.Sd3#
      • 1...Bb8
        • 2.Sd3#
      • 1...Rxb4!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qxc4#
      • 1...Rxb4
        • 2.Qc4#
      • 1...Rc1
        • 2.Qe3#
      • 1...Rc2
        • 2.Qe3#
      • 1...Rc3
        • 2.Qxc3#
      • 1...Rd4
        • 2.Qb5#
      • 1...Re4
        • 2.Qd5#
      • 1...Rf4
        • 2.Qd6#
      • 1...Bd5
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(c);S_CUTB(a)::QAR1(A)
    • R(c);S_CUTB(b)::QAB1(A)
    • B(a);N_GUARD::QAR1(A),XB(a)
    • B(b);N_GUARD::QAB1(A)
    • B(b);N_GUARD::QAB1(A),XB(b)
    • P(d);S_CUTB(b)::QAB1(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::B(B)+S(C),DCHECK
        • B(b);::B(B)+S(C),DCHECK
      • Refutation
        • R(c);P_SPINR(c),XS(C)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XR(c)
    • Vars
      • R(c);P_SPINR(c),XS(C)::QAR1(A)
      • R(c);N_GUARD::QAB(A)
      • R(c);OGATEB::QAR2(A),XR(c)
      • R(c);OGATE,SBLOCK::QAR1(A)
      • R(c);S_CUTB(a)::QAR1(A)
      • R(c);S_CUTB(b)::QAB1(A)
      • B(a);N_GUARD::QAR1(A),XB(a)
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