MESON Chess Problem Database

Problem Display
PID: 251638 (1R5b/1B6/2Pp4/1b1N4/pPk1K3/qp3p2/1P3Q2/2n5 w - - 0 1)

Guida, Marco

The Problemist, 2021

1R5b/1B6/2Pp4/1b1N4/pPk1K3/qp3p2/1P3Q2/2n5

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb4
      • 2.Sb6#
    • 1...Ba6
      • 2.Bxa6#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Sa2
      • 2.Qf1#
  • Tries
    • 1.Qf1+?
      • 1...Sd3
        • 2.Qxd3#
      • 1...Se2!
    • 1.Qc2+?
      • 1...Bc3
        • 2.Qxc3#
      • 1...bxc2!
    • 1.Qd2?
      • threat
        • 2.Se3#
        • 2.Sb6#
      • 1...Qxb4
        • 2.Qxb4#
      • 1...Ba6
        • 2.Bxa6#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bxc6!
  • Keys
    • 1.Ba6!
      • threat
        • 2.Bxb5#
      • 1...Qxb4
        • 2.Sb6#
      • 1...Bxa6
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • Q(b);SBLOCK,XP(C)::S(E)
    • B(g);OGATEB::B(G),XB(g)
    • B(i);N_GUARD::QAR1(B),XB(i)
    • S(a);N_GUARD::QAB(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(B),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(B);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR1(B),XB(i)
      • Refutation
        • P(c);XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);OGATE,XP(C)::QAR1(B),XQ(b)
        • B(g);OGATEB::B(G),XB(g)
        • B(i);N_GUARD::QAR1(B),XB(i)
      • Refutation
        • B(g);P_PINS(E),XP(F)
  • Actual
    • B(G);P_PINB(g)
    • Threat
      • B(G),XB(g)
    • Vars
      • Q(b);SBLOCK,XP(C)::S(E)
      • B(g);N_SPINB(g),XB(G)::S(E)
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