MESON Chess Problem Database

Problem Display
PID: 182769 (8/Q4K2/2NP1P2/1P1k2p1/n3N3/3P2q1/b3n1B1/8 w - - 0 1)

Alkaff, Muchsin

Tan Hien Yan

2nd HM., Boletim da UBP, 1962

8/Q4K2/2NP1P2/1P1k2p1/n3N3/3P2q1/b3n1B1/8

#2

9 + 6

136 Problem Observer 2015
136 Problem Observer 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Sb4#
    • 1...Qxd6
      • 2.Sd2#
      • 2.Sf2#
      • 2.Sc3#
      • 2.Sg3#
      • 2.Sc5#
      • 2.Sxg5#
    • 1...Sc1
      • 2.Qd4#
    • 1...Sg1
      • 2.Qd4#
    • 1...Sec3
      • 2.Qd4#
    • 1...Sd4
      • 2.Qxd4#
    • 1...Sf4
      • 2.Qd4#
    • 1...Sb2
      • 2.Qc5#
    • 1...Sac3
      • 2.Qc5#
    • 1...Sc5
      • 2.Qxc5#
  • Tries
    • 1.Qxa4?
      • threat
        • 2.Qxa2#
      • 1...Bb1
        • 2.Qb3#
        • 2.Qc4#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bc4
        • 2.Qxc4#
        • 2.dxc4#
      • 1...Sc1
        • 2.Qd4#
      • 1...Sc3
        • 2.Qd4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Qxd3!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qe6#
      • 1...Qxd6
        • 2.Qxd6#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Qh3
        • 2.Qe5#
      • 1...Qg4
        • 2.Qe5#
      • 1...Sd4
        • 2.Sb4#
      • 1...Sf4
        • 2.Qe5#
      • 1...Sc5
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(c);SBLOCK::S(E)
    • S(b);N_GUARD::QAR1(H)
    • S(b);N_GUARD::QAR1(H),XS(b)
    • S(d);N_GUARD::QAR1(H)
    • S(d);N_GUARD::QAR1(H),XS(d)
  • Tries
    • Try
      • Q(H);XS(d)
      • Threat
        • QAB(H),XB(a)
      • Vars
        • B(a);N_GUARD::QAB(H),XB(a)
        • S(b);N_GUARD::QAR1(H)
        • S(b);N_GUARD::QAR1(H),XS(b)
      • Refutation
        • Q(c);XP(B)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H)
    • Vars
      • Q(c);OGATE,XP(F)::QAR1(H),XQ(c)
      • Q(c);N_GUARD::QAR1(H),XQ(c)
      • Q(c);N_GUARD::QAR1(H)
      • S(b);SBLOCK::S(E)
      • S(b);S_CUTQ(c)::QAR1(H)
      • S(d);SBLOCK::B(A)+S(C),DCHECK
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