MESON Chess Problem Database

Problem Display
PID: 64419 (qb1QN1n1/8/p5p1/P3p1K1/4k3/1P2Pp2/1nP1R3/5BB1 w - - 0 1)

Widdows, TH

Chess, 1947

qb1QN1n1/8/p5p1/P3p1K1/4k3/1P2Pp2/1nP1R3/5BB1

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Qxa8#
    • 1...Ba7
      • 2.Qxa8#
    • 1...Bc7
      • 2.Qxa8#
    • 1...Sd1
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
      • 2.cxd3#
    • 1...Sa4
      • 2.Qd3#
    • 1...Sc4
      • 2.Qd3#
    • 1...Sf6
      • 2.Sxf6#
    • 1...Sh6
      • 2.Sf6#
    • 1...Se7
      • 2.Sf6#
    • 1...fxe2
      • 2.Bg2#
    • 1...f2
      • 2.Bg2#
  • Tries
    • 1.Sd6+?
      • 1...Bxd6
        • 2.Qxa8#
      • 1...Kd5!
    • 1.Rg2?
      • threat
        • 2.Rg4#
      • 1...fxg2
        • 2.Bxg2#
      • 1...Bd6
        • 2.Qxa8#
      • 1...Sd3
        • 2.Bxd3#
        • 2.Qxd3#
        • 2.cxd3#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sh6
        • 2.Sf6#
      • 1...f2!
    • 1.Rh2?
      • threat
        • 2.Rh4#
      • 1...Bd6
        • 2.Qxa8#
      • 1...Sd3
        • 2.Bxd3#
        • 2.Qxd3#
        • 2.cxd3#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sh6
        • 2.Sf6#
      • 1...f2!
  • Keys
    • 1.Qc8!
      • 1...Kd5
        • 2.e4#
      • 1...fxe2
        • 2.Bg2#
      • 1...f2
        • 2.Bg2#
      • 1...Qd5
        • 2.Qg4#
      • 1...Qc6
        • 2.Qxc6#
      • 1...Qb7
        • 2.Qxb7#
      • 1...Qa7
        • 2.Qc6#
      • 1...Bd6
        • 2.Qxa8#
      • 1...Ba7
        • 2.Qxa8#
      • 1...Bc7
        • 2.Qxa8#
      • 1...Sd1
        • 2.Qc4#
      • 1...Sd3
        • 2.Qc4#
      • 1...Sa4
        • 2.Qc4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sh6
        • 2.Sf6#
      • 1...Se7
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • B(h);OGATE::QAB(I),XQ(g)
    • S(a);N_GUARD::QAB1(I)
    • S(i);N_GUARD::S(J),XS(i)
    • S(i);N_GUARD::S(J)
    • P(b);OGATEB,XR(D)::B(A)
    • P(b);OGATEB::B(A)
  • Tries
    • Try
      • S(J);CHECK
      • Vars
        • B(h);OGATE,XS(J)::QAB(I),XQ(g)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(D);
      • Threat
        • R(D)
      • Vars
        • P(b);OGATE,XR(D)::B(A),XP(b)
        • B(h);OGATE::QAB(I),XQ(g)
        • S(i);N_GUARD::S(J),XS(i)
        • S(i);N_GUARD::S(J)
      • Refutation
        • P(b);
    • Try
      • R(D);
      • Threat
        • R(D)
      • Vars
        • B(h);OGATE::QAB(I),XQ(g)
        • S(i);N_GUARD::S(J),XS(i)
        • S(i);N_GUARD::S(J)
      • Refutation
        • P(b);
  • Actual
    • Q(I);
    • Vars
      • K(c);OGATE,S_FLIGHT::P(F)
      • P(b);OGATEB,XR(D)::B(A)
      • P(b);OGATEB::B(A)
      • Q(g);SBLOCK::QAR2(I)
      • Q(g);N_GUARD::QAB(I),XQ(g)
      • Q(g);N_GUARD::QAB(I)
      • B(h);OGATE::QAB(I),XQ(g)
      • S(a);N_GUARD::QAR2(I)
      • S(a);N_GUARD::QAR2(I),XS(a)
      • S(i);N_GUARD::S(J),XS(i)
      • S(i);N_GUARD::S(J)
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