MESON Chess Problem Database

Problem Display
PID: 32647 (3B4/p2K2b1/6P1/1n1pkN2/3q4/3B2P1/6p1/Q7 w - - 0 1)

Portilla, Vincente Maria Norberto

Source?, 0000

3B4/p2K2b1/6P1/1n1pkN2/3q4/3B2P1/6p1/Q7

#2

7 + 7

3498 Chess Problems by V. M. N. Portilla 1873

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Qxd4#
    • 1...Sd6
      • 2.Qxd4#
    • 1...Sc7
      • 2.Qxd4#
  • Tries
    • 1.Bc7+?
      • 1...Sd6
        • 2.Qxd4#
      • 1...Sxc7
        • 2.Qxd4#
      • 1...Kf6!
    • 1.Qe1+?
      • 1...Qe3
        • 2.Qxe3#
      • 1...Qe4!
    • 1.Qa6?
      • threat
        • 2.Qe6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sc7
        • 2.Bxc7#
        • 2.Qd6#
      • 1...Qb6!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sc6#
      • 1...Kf6
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • S(c);N_GUARD::QAB1(A),XQ(b)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • S(c);P_SPINS(c)::QAB1(A),XQ(b)
        • S(c);XB(G)::QAB1(A),XQ(b)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(A);CHECK,N_PINQ(b)
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAR2(A),XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • Q(A);N_PINQ(b)
      • Threat
        • QAR1(A)
      • Vars
        • S(c);N_GUARD::QAB1(A),XS(c)
      • Refutation
        • Q(b);
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(e);S_FLIGHT::B(G)+S(D)
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