MESON Chess Problem Database

Problem Display
PID: 86721 (3rRBB1/r2Q2b1/3N4/2ppp3/3k4/1p3bp1/2pPp3/n1N1K3 w - - 0 1)

Lamba, Stelian

Buletin Problemistic, 1970

3rRBB1/r2Q2b1/3N4/2ppp3/3k4/1p3bp1/2pPp3/n1N1K3

#2

8 + 13

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...c4
      • 2.Qxa7#
    • 1...e4
      • 2.Bxg7#
  • Tries
    • 1.Bxg7?
      • threat
        • 2.Bxe5#
      • 1...c4
        • 2.Qxa7#
      • 1...Rxe8!
    • 1.Qa4+?
      • 1...c4
        • 2.Qxa7#
      • 1...Rxa4!
    • 1.Qf5?
      • threat
        • 2.Qd3#
      • 1...c4
        • 2.Sb5#
      • 1...e4
        • 2.Qxd5#
      • 1...Be4!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qd3#
      • 1...Be4
        • 2.Sxe2#
      • 1...c4
        • 2.Qb6#
      • 1...e4
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(h);OGATEB::QAB(E),XR(k)
    • P(j);OGATEB::B(G),XB(l)
  • Tries
    • Try
      • B(G);P_PINP(j),XB(l)
      • Threat
        • B(G),XP(j)
      • Vars
        • P(h);OGATEB::QAB(E),XR(k)
      • Refutation
        • R(m);XR(F)
    • Try
      • Q(E);CHECK
      • Vars
        • P(h);OGATEB,P_SPINP(h)::QAB(E),XR(k)
      • Refutation
        • R(k);XQ(E)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • P(h);SBLOCK::S(D)
        • P(j);OGATE::QAR1(E),XP(i)
      • Refutation
        • B(e);
  • Actual
    • Q(E);
    • Threat
      • QAR1(E)
    • Vars
      • B(e);N_GUARD::S(A),XP(c)
      • P(h);OGATEB::QAB(E)
      • P(j);::S(D)
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