MESON Chess Problem Database

Problem Display
PID: 67513 (b2K3B/8/B2N1p2/R6R/3k4/2p1nrp1/Q7/1n6 w - - 0 1)

Sibbald, DR

Chess, 1948

b2K3B/8/B2N1p2/R6R/3k4/2p1nrp1/Q7/1n6

#2

7 + 8

SOLUTION

  • SOUND
  • Tries
    • 1.Rh4+?
      • 1...Rf4
        • 2.Bxf6#
      • 1...Be4
        • 2.Rxe4#
      • 1...Sg4!
    • 1.Qxb1?
      • threat
        • 2.Qd3#
        • 2.Qb6#
      • 1...Sd1
        • 2.Qb6#
      • 1...Sf1
        • 2.Qb6#
      • 1...Sc2
        • 2.Qb6#
      • 1...Sg2
        • 2.Qb6#
      • 1...Sg4
        • 2.Qb6#
      • 1...Sd5
        • 2.Qe4#
      • 1...Sf5
        • 2.Qb6#
      • 1...c2
        • 2.Qa1#
        • 2.Qb2#
      • 1...Rf5
        • 2.Qd3#
      • 1...Be4
        • 2.Qxe4#
        • 2.Qb6#
      • 1...Sc4!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qd3#
      • 1...Be4
        • 2.Sb5#
      • 1...Sd1
        • 2.Sb5#
        • 2.Ra4#
      • 1...Sf1
        • 2.Sb5#
        • 2.Ra4#
      • 1...Sc2
        • 2.Sb5#
      • 1...Sg2
        • 2.Sb5#
        • 2.Ra4#
      • 1...Sc4
        • 2.Sb5#
      • 1...Sg4
        • 2.Sb5#
        • 2.Ra4#
      • 1...Sd5
        • 2.Qe4#
      • 1...Sf5
        • 2.Bxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • R(d);P_SPINR(d)::B(G),XP(g)
        • B(h);N_GUARD,P_SPINB(h)::R1(C),XB(h)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(A);XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);::QAB(A)
        • S(c);S_CUTB(h)::QAR1(A)
        • R(d);::QAR1(A)
      • Refutation
        • S(c);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • B(h);SBLOCK::S(E)
      • S(c);::S(E)
      • S(c);OGATE::QAR1(A)
      • S(c);S_CUTR(d)::B(G),XP(g)
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