MESON Chess Problem Database

Problem Display
PID: 78498 (3nB2q/5b2/rR3b1p/p1Nk2p1/R3p1p1/3Np1B1/1n1Q4/6K1 w - - 0 1)

Langstaff, William A

4th HM., Hampshire Telegraph and Post, 1921

3nB2q/5b2/rR3b1p/p1Nk2p1/R3p1p1/3Np1B1/1n1Q4/6K1

#2

8 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Ra7
      • 2.Rd6#
    • 1...Ra8
      • 2.Rd6#
    • 1...Sd1
      • 2.Qa2#
    • 1...Sc6
      • 2.Bxc6#
      • 2.Bxf7#
    • 1...Se6
      • 2.Bc6#
    • 1...Sb7
      • 2.Bc6#
      • 2.Bxf7#
  • Tries
    • 1.Sf4+?
      • 1...Kxc5
        • 2.Rb5#
        • 2.Qd6#
      • 1...Ke5!
    • 1.Sxa6?
      • threat
        • 2.Sc7#
        • 2.Rd6#
        • 2.Qxa5#
      • 1...Qxe8
        • 2.Sc7#
        • 2.Rd6#
      • 1...Bxe8
        • 2.Sc7#
        • 2.Rd6#
      • 1...Sxd3
        • 2.Rd6#
        • 2.Qa2#
      • 1...exd2
        • 2.Sc7#
        • 2.Rd6#
      • 1...exd3
        • 2.Rd6#
        • 2.Qxa5#
        • 2.Qg2#
      • 1...Sc4
        • 2.Sdb4#
      • 1...Sc6
        • 2.Sc7#
        • 2.Bxf7#
      • 1...Bd4
        • 2.Sc7#
        • 2.Rd6#
      • 1...Qf8
        • 2.Sc7#
      • 1...Bc3
        • 2.Sc7#
        • 2.Rd6#
      • 1...Be5
        • 2.Sf4#
        • 2.Qxa5#
      • 1...Be7
        • 2.Sc7#
      • 1...Se6
        • 2.Bc6#
        • 2.Rd6#
      • 1...Sb7
        • 2.Sc7#
        • 2.Bxf7#
      • 1...Sxa4!
    • 1.Bxf7+?
      • 1...Se6
        • 2.Bxe6#
      • 1...Sxf7!
  • Keys
    • 1.Se6!
      • threat
        • 2.Sc7#
      • 1...Bxe6
        • 2.Rb5#
      • 1...Sxd3
        • 2.Qa2#
      • 1...Sxa4
        • 2.Qa2#
      • 1...Sxe6
        • 2.Bc6#
      • 1...exd3
        • 2.Qg2#
      • 1...Ra7
        • 2.Rd6#
      • 1...Be5
        • 2.Sdf4#
      • 1...Sc4
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • R(h);N_GUARD::R1(G)
    • S(a);OGATE::QAB(B)
    • S(l);N_GUARD::B(H)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • S(F);XR(h)
      • Threat
        • DUALS(3)
      • Vars
        • S(a);SBLOCK::QAR(B)+S(C),DCHECK
        • Q(m);::S(F)
        • B(i);::S(F)
      • Refutation
        • S(a);XR(E)
    • Try
      • B(H);CHECK,XB(k)
      • Vars
        • S(l);N_GUARD,P_SPINS(l)::B(H),XS(l)
      • Refutation
        • S(l);XB(H)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • B(k);SBLOCK,XS(F)::R(G)
      • S(a);OGATE,P_SPINS(a),XS(C)::QAB(B)
      • S(a);OGATE,XR(E)::QAB(B)
      • S(l);N_GUARD,SBLOCK,XS(F)::B(H)
      • P(c);OGATEB,P_SPINP(c),XS(C)::QAB(B)
      • R(h);N_GUARD::R1(G)
      • B(i);SBLOCK::QAR(B)+S(C),DCHECK
      • S(a);SBLOCK::QAR(B)+S(C),DCHECK
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