MESON Chess Problem Database

Problem Display
PID: 15134 (K3RQ2/p2p4/4N3/r2P1PP1/3Pk1q1/3pNpp1/8/b2BR2r w - - 0 1)

Petkov, Petko Andonov

HM., Gazeta Czestochowska, 1980

K3RQ2/p2p4/4N3/r2P1PP1/3Pk1q1/3pNpp1/8/b2BR2r

#2

11 + 10

3840 Petkov Selected Compositions 2000

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5
      • 2.Qxf5#
    • 1...Rxd5
      • 2.Sf1#
    • 1...d2
      • 2.Bc2#
  • Tries
    • 1.Sf4+?
      • 1...Kxd4
        • 2.Qb4#
      • 1...Kxf4!
    • 1.Sc7+?
      • 1...Kxd4
        • 2.Qb4#
      • 1...Kf4!
    • 1.Sg7+?
      • 1...Kxd4
        • 2.Qb4#
      • 1...Kf4!
    • 1.Sd8+?
      • 1...Kxd4
        • 2.Qb4#
      • 1...Kf4!
    • 1.Qf6?
      • threat
        • 2.Qe5#
      • 1...Qxf5
        • 2.Qxf5#
      • 1...Rxd5
        • 2.Sf1#
      • 1...Bxd4
        • 2.Qxd4#
      • 1...d2
        • 2.Bc2#
      • 1...Qf4
        • 2.Sc5#
      • 1...d6!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qe5#
      • 1...Qxf5
        • 2.Sf1#
      • 1...Rxd5
        • 2.Qxd5#
      • 1...Bxd4
        • 2.Sc5#
      • 1...d2
        • 2.Bc2#
      • 1...Qf4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);OGATE,XP(F)::QAB1(K),XQ(g)
    • R(h);SBLOCK,XP(E)::R(B)+S(C)
    • P(c);OGATEB::B(A)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(f);P-FLIGHT,XP(D)::QAR2(K)
      • Refutation
        • K(f);P-FLIGHT,XS(H)
    • Try
      • S(H);CHECK
      • Vars
        • K(f);P-FLIGHT,XP(D)::QAR2(K)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • S(H);CHECK
      • Vars
        • K(f);P-FLIGHT,XP(D)::QAR2(K)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • S(H);CHECK
      • Vars
        • K(f);P-FLIGHT,XP(D)::QAR2(K)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • Q(K);
      • Threat
        • QAR1(K)
      • Vars
        • Q(g);OGATE,XP(F)::QAB1(K),XQ(g)
        • R(h);SBLOCK,XP(E)::R(B)+S(C)
        • B(a);OGATE,XP(D)::QAR1(K),XB(a)
        • P(c);OGATEB::B(A)
        • Q(g);SBLOCK::R(J)+S(H),DCHECK
      • Refutation
        • P(j);
  • Actual
    • Q(K);
    • Threat
      • QAR1(K)
    • Vars
      • Q(g);SBLOCK,XP(F)::R(B)+S(C)
      • R(h);OGATE,XP(E)::QAB1(K),XR(h)
      • B(a);SBLOCK,XP(D)::R(J)+S(H),DCHECK
      • P(c);OGATEB::B(A)
      • Q(g);N_GUARD::QAR1(K),XQ(g)
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