MESON Chess Problem Database

Problem Display
PID: 87806 (4B1bK/n5Qp/R7/N1k2r1r/PN3p2/P1q5/8/b1R5 w - - 0 1)

Soennecken, Albrecht

American Chess Problemist, 1950

4B1bK/n5Qp/R7/N1k2r1r/PN3p2/P1q5/8/b1R5

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Sb3#
      • 2.Sb7#
    • 1...Re5
      • 2.Qxa7#
    • 1...Rf6
      • 2.Qg1#
    • 1...Bc4
      • 2.Sb7#
    • 1...Bd5
      • 2.Sd3#
    • 1...Sb5
      • 2.Rc6#
    • 1...Sc6
      • 2.Rxc6#
    • 1...Sc8
      • 2.Rc6#
  • Tries
    • 1.Rxc3+?
      • 1...Bc4
        • 2.Sb3#
        • 2.Sb7#
        • 2.Rxc4#
        • 2.Qg1#
        • 2.Qxa7#
      • 1...Bxc3!
    • 1.Qxc3+?
      • 1...Bc4
        • 2.Sb3#
        • 2.Sb7#
      • 1...Bxc3+!
    • 1.Qe5+?
      • 1...Bd5
        • 2.Sd3#
      • 1...Rxe5!
  • Keys
    • 1.Bb5!
      • threat
        • 2.Sb7#
      • 1...Sxb5
        • 2.Rc6#
      • 1...Re5
        • 2.Qxa7#
      • 1...Rf6
        • 2.Qg1#
      • 1...Rf7
        • 2.Sb3#
      • 1...Bd5
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(e);N_PINQ(G)::QAB(G),XS(g)
    • R(e);N_PINQ(G)::QAB(G)
    • B(i);N_SPINQ(b),SBLOCK::S(E)
    • B(i);SBLOCK::S(D)
    • S(g);N_GUARD::R1(F)
    • S(g);N_GUARD::R1(F),XS(g)
  • Tries
    • Try
      • R(A);CHECK,N_SPINQ(G),XQ(b)
      • Refutation
        • B(a);P_PINQ(G),XR(A)
    • Try
      • Q(G);CHECK,XQ(b)
      • Refutation
        • B(a);CHECK,P_SPINB(a),XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • B(i);P_SPINB(i)::S(D)
      • Refutation
        • R(e);XQ(G)
  • Actual
    • B(H);
    • Threat
      • S(E)
    • Vars
      • S(g);N_GUARD,XB(H)::R1(F)
      • R(e);N_PINQ(G)::QAB(G),XS(g)
      • R(e);N_PINQ(G)::QAB(G)
      • R(e);S_CUTB(i)::S(E)
      • B(i);SBLOCK::S(D)
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