MESON Chess Problem Database

Problem Display
PID: 223278 (b4N2/4p2r/6Qp/2pkB3/1p2NP2/1K3p1r/2P5/3n2bB w - - 0 1)

Anonymous

English Mechanic and World of Science, 1886

(First published on Fri Dec 17 1886)

b4N2/4p2r/6Qp/2pkB3/1p2NP2/1K3p1r/2P5/3n2bB

#2

8 + 11

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...f2+
      • 2.Sc3#
  • Tries
    • 1.Sd2?
      • threat
        • 2.Qe4#
        • 2.Qe6#
      • 1...e6
        • 2.Qe4#
        • 2.Qxe6#
      • 1...Sf2
        • 2.Qe6#
      • 1...Sc3
        • 2.Qe6#
      • 1...c4+!
    • 1.Qd6+?
      • 1...Kxe4
        • 2.Qd3#
      • 1...exd6!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qxa8#
      • 1...f2+
        • 2.Sc3#
      • 1...c4+
        • 2.Qxc4#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Bc6
        • 2.Qc4#
      • 1...Bb7
        • 2.Qxb7#
      • 1...e6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • P(c);CHECK::B(A)+S(D),DCHECK
  • Tries
    • Try
      • S(D);P_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::QAB1(G)
      • Refutation
        • P(f);CHECK
    • Try
      • Q(G);CHECK
      • Vars
        • K(g);OGATE,P_SPINP(c),S_FLIGHT,XS(D)::QAB1(G)
      • Refutation
        • P(i);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAB(G),XB(k)
    • Vars
      • P(c);CHECK::B(A)+S(D),DCHECK
      • P(f);CHECK::QAB1(G),XP(f)
      • K(g);P_SPINP(c),S_FLIGHT,XS(D)::QAB1(G)
      • B(k);SBLOCK::QAB1(G)
      • B(k);N_GUARD::QAB(G),XB(k)
      • P(i);N_GUARD::S(D)
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