MESON Chess Problem Database

Problem Display
PID: 102910 (8/8/8/8/6p1/4N1P1/1nQpkBP1/b5K1 w - - 0 1)

Seidemann, Felix

Palestine Post, 1940

8/8/8/8/6p1/4N1P1/1nQpkBP1/b5K1

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qc4#
    • 1...Sd3
      • 2.Qd1#
    • 1...Sa4
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
  • Tries
    • 1.Sd5?
      • threat
        • 2.Sc3#
        • 2.Sf4#
      • 1...Sd1
        • 2.Sf4#
        • 2.Qc4#
      • 1...Sa4
        • 2.Sf4#
      • 1...Sc4
        • 2.Sf4#
      • 1...Sd3!
    • 1.Qc4+?
      • 1...Sd3
        • 2.Qxg4#
      • 1...Sxc4!
  • Keys
    • 1.Qe4!
      • 1...d1Q+
        • 2.Sf1#
      • 1...d1R+
        • 2.Sf1#
      • 1...d1S
        • 2.Qc2#
      • 1...d1B
        • 2.Sf1#
        • 2.Sc4#
      • 1...Sd3
        • 2.Qxg4#
      • 1...Sd1
        • 2.Qc4#
      • 1...Sa4
        • 2.Qc4#
      • 1...Sc4
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAB(B)
    • S(b);N_GUARD,SBLOCK::QAB1(B)
    • S(b);N_GUARD::QAB(B),XS(b)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::S(E)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK,N_PINP(c)
      • Vars
        • S(b);P_SPINS(b),SBLOCK::QAB(B),XP(e)
      • Refutation
        • S(b);XQ(B)
  • Actual
    • Q(B);N_PINP(c)
    • Vars
      • P(c);CHECK,SBLOCK::QAR(B)+S(E)
      • P(c);OGATEB::QAR2(B)
      • S(b);SBLOCK::QAB(B),XP(e)
      • S(b);N_GUARD::QAB(B)
      • S(b);N_GUARD::QAB(B),XS(b)
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Developed and maintained by Brian Stephenson.
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