MESON Chess Problem Database

Problem Display
PID: 98981 (B4R2/8/q2B3p/1PPPNPpK/R2Pk3/6Qp/3rr3/4N1n1 w - - 0 1)

Apro, Laszlo

Magyar Sakkszovetseg, 1977

B4R2/8/q2B3p/1PPPNPpK/R2Pk3/6Qp/3rr3/4N1n1

#2

13 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Qg4#
    • 1...Sf3
      • 2.Qxf3#
  • Tries
    • 1.S5f3?
      • threat
        • 2.Qe5#
      • 1...Ke3
        • 2.Re8#
      • 1...Rxe1
        • 2.Sxd2#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Qxd6!
    • 1.Sc6?
      • threat
        • 2.Qe5#
      • 1...Kxd5
        • 2.Se7#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Rxe1!
    • 1.Sf7?
      • threat
        • 2.Qe5#
      • 1...Kxf5
        • 2.Sxg5#
      • 1...Qxd6
        • 2.Sxd6#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Rxe1!
    • 1.Qd3+?
      • 1...Kf4
        • 2.Sg6#
      • 1...Rxd3!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Qe5#
        • 2.Qg4#
      • 1...Kxd4
        • 2.Sa5#
      • 1...Qxd6
        • 2.Sxd6#
      • 1...Qxa8
        • 2.Qe5#
      • 1...Rxe1
        • 2.Sxd2#
      • 1...Qb7
        • 2.Qe5#
      • 1...Qc6
        • 2.Qe5#
      • 1...Rf2
        • 2.Qe5#
        • 2.Qe3#
      • 1...Rg2
        • 2.Qe5#
        • 2.Qe3#
      • 1...Sf3
        • 2.Qg4#
      • 1...g4
        • 2.Qf4#
        • 2.Qe5#
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(c);SBLOCK::QAR2(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • S(H);
      • Threat
        • QAR1(B)
      • Vars
        • K(e);P-FLIGHT::R(M)
        • R(c);N_GUARD,XS(A)::S(H),XR(b)
        • S(a);OGATE,XS(H)::QAB1(B),XS(a)
      • Refutation
        • Q(g);XB(K)
    • Try
      • S(H);
      • Threat
        • QAR1(B)
      • Vars
        • K(e);S_FLIGHT,XP(G)::B(L)+S(H),DCHECK
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • R(c);XS(A)
    • Try
      • S(H);
      • Threat
        • QAR1(B)
      • Vars
        • K(e);S_FLIGHT,XP(I)::R(M)+S(H),XP(f)
        • Q(g);XB(K)::S(H),XQ(g)
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • R(c);XS(A)
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);P-FLIGHT::B(K)+S(H),DCHECK
      • Refutation
        • R(b);XQ(B)
  • Actual
    • S(H);
    • Threat
      • DUALS(2)
    • Vars
      • K(e);P-FLIGHT,XP(D)::R(C)+S(H)
      • Q(g);XB(K)::S(H),XQ(g)
      • Q(g);XB(L)::QAR1(B)
      • R(c);N_GUARD,XS(A)::S(H),XR(b)
      • Q(g);::QAR1(B)
      • S(a);::QAR2(B)
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