MESON Chess Problem Database

Problem Display
PID: 121133 (8/8/7Q/4b3/5R2/2N1k3/4P1n1/2K5 w - - 0 1)

Wurzburg, Otto

Orillia Packet, 1897

8/8/7Q/4b3/5R2/2N1k3/4P1n1/2K5

#2

5 + 3

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.Rf3#
    • 1...Bxf4
      • 2.Qb6#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Qg3#
        • 2.Qxe5#
      • 1...Bxf4
        • 2.Qc5#
      • 1...Sxf4
        • 2.Qg1#
      • 1...Bd4
        • 2.Rf3#
        • 2.Qg3#
      • 1...Bd6
        • 2.Qg3#
      • 1...Bf6
        • 2.Qg3#
      • 1...Bc7
        • 2.Qg3#
      • 1...Bg7
        • 2.Qg3#
      • 1...Bb8
        • 2.Qg3#
      • 1...Bh8
        • 2.Qg3#
      • 1...Se1
        • 2.Qxe5#
      • 1...Sh4
        • 2.Qxe5#
      • 1...Bxc3!
    • 1.Qh2?
      • threat
        • 2.Qg3#
      • 1...Bxf4
        • 2.Qg1#
      • 1...Sxf4
        • 2.Qg1#
      • 1...Se1
        • 2.Sd1#
        • 2.Sd5#
        • 2.Re4#
        • 2.Qf2#
      • 1...Sh4
        • 2.Sd1#
        • 2.Sd5#
        • 2.Re4#
        • 2.Qf2#
      • 1...Bxc3!
    • 1.Qb6+?
      • 1...Bd4
        • 2.Rf3#
        • 2.Qxd4#
      • 1...Kxf4!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qe4#
        • 2.Qg3#
      • 1...Kxf4
        • 2.Sd5#
      • 1...Bxc3
        • 2.Qe4#
      • 1...Bxf4
        • 2.Qb6#
      • 1...Sxf4
        • 2.Qg1#
      • 1...Se1
        • 2.Qe4#
      • 1...Sh4
        • 2.Qe4#

This anticipates 12287(1977)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • B(c);SBLOCK::QAB(E)+R(D),DCHECK
    • B(c);N_GUARD,P_SPINB(c),SBLOCK,XR(D)::QAB(E)
  • Tries
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);OGATE,P_SPINB(c),SBLOCK,XR(D)::QAB(E)
        • S(a);OGATE,P_SPINS(a),SBLOCK,XR(D)::QAB(E)
        • B(c);::QAR2(E)
        • S(a);::QAR2(E),XB(c)
      • Refutation
        • B(c);XS(C)
    • Try
      • Q(E);
      • Threat
        • QAR2(E)
      • Vars
        • B(c);SBLOCK,XR(D)::QAB(E)
        • S(a);SBLOCK,XR(D)::QAB(E)
      • Refutation
        • B(c);XS(C)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(b);S_FLIGHT,XR(D)
  • Actual
    • Q(E);
    • Threat
      • DUALS(2)
    • Vars
      • K(b);S_FLIGHT,XR(D)::S(C)
      • B(c);XS(C)::QAR1(E)
      • B(c);N_GUARD,SBLOCK,XR(D)::QAB(E)
      • S(a);OGATE,SBLOCK,XR(D)::QAB(E)
      • S(a);::QAR1(E)
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