MESON Chess Problem Database

Problem Display
PID: 141402 (b5QK/q3pPRB/4pp1B/1N2k3/p1P5/2PP1p2/5n1N/3r1r2 w - - 0 1)

Markwick, Frederick W

Source?, 1882

b5QK/q3pPRB/4pp1B/1N2k3/p1P5/2PP1p2/5n1N/3r1r2

#2

11 + 11

14867 BCPS Library 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Qb8#
    • 1...Qd4
      • 2.cxd4#
    • 1...Qb8
      • 2.Qxb8#
    • 1...Sh1
      • 2.Sg4#
    • 1...Sxd3
      • 2.Sg4#
    • 1...Sh3
      • 2.Sg4#
    • 1...Se4
      • 2.Sg4#
    • 1...Sg4
      • 2.Sxg4#
  • Tries
    • 1.Rg1?
      • threat
        • 2.Qg3#
      • 1...Sxd3
        • 2.Sg4#
      • 1...f5
        • 2.Qg7#
      • 1...Qe3
        • 2.Qb8#
      • 1...Qd4
        • 2.cxd4#
      • 1...Qb8
        • 2.Qxb8#
      • 1...Sh1
        • 2.Sg4#
      • 1...Sh3
        • 2.Sg4#
      • 1...Se4
        • 2.Sg4#
      • 1...Sg4
        • 2.Sxg4#
      • 1...Rxg1!
    • 1.Rg5+?
      • 1...Kf4
        • 2.Rc5#
        • 2.Rd5#
        • 2.Rf5#
        • 2.Rh5#
      • 1...fxg5
        • 2.Qxg5#
      • 1...f5!
    • 1.Qb8+?
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qxb8+!
    • 1.f8S?
      • threat
        • 2.Qxe6#
      • 1...Qb6
        • 2.Sd7#
      • 1...Qa6
        • 2.Sd7#
      • 1...Qd7
        • 2.Sxd7#
      • 1...Bd5!
  • Keys
    • 1.Rg2!
      • threat
        • 2.Qg3#
      • 1...Sxd3
        • 2.Sg4#
      • 1...f5
        • 2.Qg7#
      • 1...Qe3
        • 2.Qb8#
      • 1...Qd4
        • 2.cxd4#
      • 1...Qb8
        • 2.Qxb8#
      • 1...Sh1
        • 2.Sg4#
      • 1...Sh3
        • 2.Sg4#
      • 1...Se4
        • 2.Sg4#
      • 1...Sg4
        • 2.Sxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(i);N_GUARD::QAB(J)
    • Q(i);OGATE::P(B),XQ(i)
    • Q(i);N_GUARD,P_PINQ(J)::QAB(J),XQ(i)
    • S(c);N_GUARD::S(A)
    • S(c);N_GUARD,XP(C)::S(A)
    • S(c);N_GUARD::S(A),XS(c)
  • Tries
    • Try
      • R(H);
      • Threat
        • QAB(J)
      • Vars
        • S(c);N_GUARD,XP(C)::S(A)
        • P(h);OGATEB::QAB(J)
        • Q(i);N_GUARD::QAB(J)
        • Q(i);OGATE::P(B),XQ(i)
        • Q(i);N_GUARD,P_PINQ(J)::QAB(J),XQ(i)
        • S(c);N_GUARD::S(A)
        • S(c);N_GUARD::S(A),XS(c)
      • Refutation
        • R(b);XR(H)
    • Try
      • R(H);CHECK
      • Vars
        • P(h);OGATE,XR(H)::QAR2(J),XP(h)
      • Refutation
        • P(h);P_SPINP(h)
    • Try
      • Q(J);CHECK
      • Vars
        • Q(i);N_GUARD,P_SPINQ(i)::QAB(J),XQ(i)
      • Refutation
        • Q(i);CHECK,XQ(J)
    • Try
      • P(G);
      • Threat
        • QAR1(J),XP(g)
      • Vars
        • Q(i);N_GUARD::S(G)
        • Q(i);N_GUARD::S(G),XQ(i)
      • Refutation
        • B(k);
  • Actual
    • R(H);
    • Threat
      • QAB(J)
    • Vars
      • S(c);N_GUARD,XP(C)::S(A)
      • P(h);OGATEB::QAB(J)
      • Q(i);N_GUARD::QAB(J)
      • Q(i);OGATE::P(B),XQ(i)
      • Q(i);N_GUARD,P_PINQ(J)::QAB(J),XQ(i)
      • S(c);N_GUARD::S(A)
      • S(c);N_GUARD::S(A),XS(c)
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