MESON Chess Problem Database

Problem Display
PID: 101213 (8/8/1N1Np2n/1K2k1B1/3bp3/1Q2n3/8/3R4 w - - 0 1)

Sander, Svante

Good Companions, 1921

8/8/1N1Np2n/1K2k1B1/3bp3/1Q2n3/8/3R4

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ba1
      • 2.Sd7#
    • 1...Bb2
      • 2.Sd7#
      • 2.Qxb2#
    • 1...Bc3
      • 2.Sd7#
      • 2.Qxc3#
    • 1...Bc5
      • 2.Sd7#
    • 1...Sxd1
      • 2.Qg3#
    • 1...Sc2
      • 2.Qg3#
    • 1...Sc4
      • 2.Qg3#
    • 1...Seg4
      • 2.Qg3#
    • 1...Sd5
      • 2.Sbc4#
    • 1...Sef5
      • 2.Sdc4#
    • 1...Shf5
      • 2.Sf7#
  • Tries
    • 1.Qd5+?
      • 1...Sxd5
        • 2.Sbc4#
      • 1...exd5!
    • 1.Qxe3?
      • threat
        • 2.Qxd4#
        • 2.Qf4#
        • 2.Qg3#
      • 1...Bxe3
        • 2.Sbc4#
        • 2.Sd7#
      • 1...Bxb6
        • 2.Qf4#
        • 2.Qg3#
        • 2.Qxe4#
      • 1...Ba1
        • 2.Sbc4#
        • 2.Sd7#
        • 2.Qf4#
        • 2.Qc5#
        • 2.Qg3#
        • 2.Qxe4#
      • 1...Bb2
        • 2.Sbc4#
        • 2.Sd7#
        • 2.Qf4#
        • 2.Qc5#
        • 2.Qg3#
        • 2.Qxe4#
      • 1...Bc3
        • 2.Sbc4#
        • 2.Sd7#
        • 2.Qf4#
        • 2.Qc5#
        • 2.Qxc3#
        • 2.Qg3#
        • 2.Qxe4#
      • 1...Bc5
        • 2.Sbc4#
        • 2.Sd7#
        • 2.Qf4#
        • 2.Qxc5#
        • 2.Qg3#
        • 2.Qxe4#
      • 1...Sf5
        • 2.Sdc4#
        • 2.Sf7#
        • 2.Qf4#
      • 1...Kxd6!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qxd4#
      • 1...Kxd6
        • 2.Qc5#
      • 1...Bxc3
        • 2.Sd7#
      • 1...Sxd1
        • 2.Qg3#
      • 1...Sc2
        • 2.Qg3#
      • 1...Sd5
        • 2.Sbc4#
      • 1...Sef5
        • 2.Sdc4#
      • 1...Shf5
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(b);::S(E)
    • S(a);OGATE,XR(A)::QAB(B)
    • S(a);OGATE::QAB(B)
    • S(a);N_GUARD,SBLOCK::S(E)
    • S(a);N_GUARD,SBLOCK::S(F)
    • S(f);N_GUARD,SBLOCK::S(F)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);SBLOCK,XQ(B)::S(E)
      • Refutation
        • P(e);XQ(B)
    • Try
      • Q(B);P_PINP(c),XS(a)
      • Threat
        • DUALS(3)
      • Refutation
        • K(d);N_SPINP(c),P_SPINB(b),S_FLIGHT,XS(F)
  • Actual
    • Q(B);P_PINB(b)
    • Threat
      • QAB1(B),XB(b)
    • Vars
      • K(d);S_FLIGHT,XS(F)::QAB1(B)
      • B(b);N_SPINB(b),XQ(B)::S(E)
      • S(a);OGATE,XR(A)::QAB(B)
      • S(a);OGATE::QAB(B)
      • S(a);N_GUARD,SBLOCK::S(E)
      • S(a);N_GUARD,SBLOCK::S(F)
      • S(f);N_GUARD,SBLOCK::S(F)
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