MESON Chess Problem Database

Problem Display
PID: 101295 (3R4/QB6/1K6/3P4/Rnrk1P2/5P2/1qpP4/B1N2b2 w - - 0 1)

Wilhelm, Joseph A

Good Companions, 1921

3R4/QB6/1K6/3P4/Rnrk1P2/5P2/1qpP4/B1N2b2

#2

11 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bd3
      • 2.Sb3#
    • 1...Sa2+
      • 2.Ka5#
      • 2.Ka6#
    • 1...Sd3+
      • 2.Sb3#
    • 1...Sxd5+
      • 2.Ka5#
      • 2.Ka6#
    • 1...Sa6+
      • 2.Kxa6#
      • 2.Bxb2#
    • 1...Sc6+
      • 2.Bxb2#
  • Tries
    • 1.Rxb4?
      • threat
        • 2.Ka5#
        • 2.Kb5#
        • 2.Ka6#
        • 2.Bxb2#
      • 1...Qxa1
        • 2.Qxa1#
      • 1...Qc3
        • 2.Ka5#
        • 2.Kb5#
        • 2.Ka6#
        • 2.Bxc3#
      • 1...Rxb4+!
  • Keys
    • 1.Ba6!
      • threat
        • 2.Qg7#
      • 1...Rc6+
        • 2.dxc6#
      • 1...Sa2+
        • 2.Ka5#
      • 1...Sd3+
        • 2.Sb3#
      • 1...Sxd5+
        • 2.Ka5#
      • 1...Sxa6+
        • 2.Kxa6#
        • 2.Bxb2#
      • 1...Sc6+
        • 2.Bxb2#
      • 1...Rc7
        • 2.Kxc7#
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::S(B)
    • S(d);CHECK,P_SPINR(e),SBLOCK::S(B)
    • S(d);CHECK,P_SPINR(e)::B(A),XQ(b)
  • Tries
    • Try
      • R(E);P_PINR(e),P_SPINR(E),XS(d)
      • Threat
        • DUALS(4)
      • Vars
        • Q(b);N_PINR(E),N_SPINQ(b),OGATE,XB(A)::QAB(I),XQ(b)
      • Refutation
        • R(e);CHECK,N_SPINR(e),XR(E)
  • Actual
    • B(J);
    • Threat
      • QAB(I)
    • Vars
      • R(e);CHECK,OGATE,P_SPINS(d)::R(K)+P(G),XR(e)
      • S(d);CHECK,P_SPINR(e)::QAB(I)+K(H)
      • S(d);CHECK,P_SPINR(e),SBLOCK::S(B)
      • S(d);CHECK,P_SPINR(e),P_SPINS(d),XP(G)::QAB(I)+K(H)
      • S(d);CHECK,P_SPINR(e)::B(A),XQ(b)
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