MESON Chess Problem Database

Problem Display
PID: 103573 (2B5/2Pn4/1B6/PkP1n3/3P4/2K5/8/R6Q w - - 0 1)

Haring, Jacobus

van Dijk, Nils Gustav Gerard

Stella Polaris, 1967

2B5/2Pn4/1B6/PkP1n3/3P4/2K5/8/R6Q

#2

9 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Qf1#
  • Tries
    • 1.Bb7?
      • threat
        • 2.Qb1#
      • 1...Sd3
        • 2.Qc6#
      • 1...Sc4
        • 2.Qc6#
      • 1...Sc6
        • 2.Qxc6#
        • 2.Qf1#
      • 1...Sxc5!
    • 1.Bxd7+?
      • 1...Ka6
        • 2.Qa8#
        • 2.c8Q#
        • 2.c8B#
      • 1...Sc6
        • 2.Qf1#
      • 1...Sxd7!
    • 1.Qd5?
      • 1...Sxc5
        • 2.Qxc5#
      • 1...Sxb6
        • 2.cxb6#
      • 1...Sd3
        • 2.Qxd7#
      • 1...Sf3
        • 2.Qxd7#
      • 1...Sc4
        • 2.Qxd7#
      • 1...Sg4
        • 2.Qxd7#
      • 1...Sc6
        • 2.Qc4#
      • 1...Sg6
        • 2.Qxd7#
      • 1...Sf7
        • 2.Qxd7#
      • 1...Sb8
        • 2.c6#
      • 1...Sf8
        • 2.c6#
      • 1...Sf6!
  • Keys
    • 1.Qb7!
      • 1...Sxc5
        • 2.Bxc5#
      • 1...Sxb6
        • 2.Qxb6#
      • 1...Sd3
        • 2.Bxd7#
      • 1...Sf3
        • 2.Bxd7#
      • 1...Sc4
        • 2.Bxd7#
      • 1...Sg4
        • 2.Bxd7#
      • 1...Sc6
        • 2.Qa6#
      • 1...Sg6
        • 2.Bxd7#
      • 1...Sf7
        • 2.Bxd7#
      • 1...Sf6
        • 2.Ba7#
      • 1...Sb8
        • 2.Ba7#
      • 1...Sf8
        • 2.Ba7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD,SBLOCK::QAB(B)
  • Tries
    • Try
      • B(I);
      • Threat
        • QAR(B)
      • Vars
        • S(b);N_GUARD::QAB1(B)
      • Refutation
        • S(c);XP(F)
    • Try
      • B(I);CHECK,XS(c)
      • Vars
        • S(b);P_SPINS(b)::QAB(B)
      • Refutation
        • S(b);XB(I)
    • Try
      • Q(B);
      • Vars
        • S(c);OGATE,P_SPINS(c),XP(F)::QAR1(B),XS(c)
        • S(c);OGATE,XB(G)::QAR(B)+P(F),XS(c)
        • S(b);N_GUARD::QAB(B),XS(c)
        • S(b);N_GUARD,SBLOCK::QAB1(B)
        • S(c);N_GUARD::QAR(B)+P(F)
      • Refutation
        • S(c);
  • Actual
    • Q(B);
    • Vars
      • S(c);OGATE,XP(F)::QAR(B)+B(G),XS(c)
      • S(c);OGATE,P_SPINS(c),XB(G)::QAR1(B),XS(c)
      • S(b);N_GUARD::B(I),XS(c)
      • S(b);SBLOCK::QAB1(B)
      • S(c);N_GUARD::QAR(B)+B(G)
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