MESON Chess Problem Database

Problem Display
PID: 258029 (q5R1/p2P4/5p2/Q4pNp/5Pk1/1b1P1N1p/4RB1P/K2B4 w - - 0 1)

Postma, Bernardus

Probleemblad, 1948

q5R1/p2P4/5p2/Q4pNp/5Pk1/1b1P1N1p/4RB1P/K2B4

#2

12 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf3
      • 2.Se6#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Qxf5#
      • 1...Kxf4
        • 2.Sxh3#
        • 2.Qxf5#
      • 1...Qe4
        • 2.Sge6#
      • 1...Qd5
        • 2.Sge6#
      • 1...Bd5
        • 2.Re4#
      • 1...Be6
        • 2.Re4#
      • 1...h4!
    • 1.Se5+?
      • 1...Kxf4
        • 2.Sxh3#
        • 2.Be3#
        • 2.Bg3#
        • 2.Qd2#
      • 1...fxe5!
    • 1.Se6+?
      • 1...Kxf3
        • 2.Rc2#
        • 2.Rg3#
      • 1...Qxg8!
  • Keys
    • 1.Sh4!
      • threat
        • 2.Qxf5#
      • 1...Kxf4
        • 2.Sxh3#
        • 2.Qxf5#
      • 1...Qe4
        • 2.Se6#
      • 1...Qd5
        • 2.Se6#
      • 1...Bd5
        • 2.Re4#
      • 1...Be6
        • 2.Re4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(h);N_GUARD,SBLOCK,XS(G)::R(L)+S(J)
  • Tries
    • Try
      • S(G);
      • Threat
        • QAB1(I),XP(d)
      • Vars
        • Q(h);N_GUARD::R(L)+S(J)
        • B(a);N_GUARD::B(B)+R(C)
      • Refutation
        • P(e);
    • Try
      • S(G);CHECK
      • Refutation
        • P(f);XS(G)
    • Try
      • S(J);CHECK
      • Refutation
        • Q(h);XR(L)
  • Actual
    • S(G);
    • Threat
      • QAB1(I),XP(d)
    • Vars
      • Q(h);N_GUARD::R(L)+S(J)
      • B(a);N_GUARD::B(B)+R(C)
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