MESON Chess Problem Database

Problem Display
PID: 180237 (8/6N1/5p2/K3pBp1/3p1k2/3PbNp1/4P2Q/2B5 w - - 0 1)

Lider, Valentin Viktorovich

6th Comm., Die Schwalbe, 1980-12

8/6N1/5p2/K3pBp1/3p1k2/3PbNp1/4P2Q/2B5

#2

8 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bd2+
      • 2.Bxd2#
    • 1...g4
      • 2.Qh6#
  • Tries
    • 1.Qh1?
      • 1...Bd2+
        • 2.Bxd2#
      • 1...Bxc1
        • 2.Qxc1#
      • 1...g2
        • 2.Qh2#
      • 1...g4
        • 2.Qh6#
      • 1...e4!
    • 1.Qh3?
      • threat
        • 2.Sh5#
        • 2.Se6#
        • 2.Qg4#
      • 1...Bd2+
        • 2.Bxd2#
      • 1...g4
        • 2.Qxg4#
        • 2.Qh6#
      • 1...Bxc1!
    • 1.Qh4+?
      • 1...g4
        • 2.Qxg4#
        • 2.Qh6#
      • 1...gxh4!
    • 1.Qh5?
      • threat
        • 2.Qg4#
      • 1...Bd2+
        • 2.Bxd2#
      • 1...g4
        • 2.Se6#
        • 2.Qxg4#
        • 2.Qh6#
      • 1...Bxc1!
    • 1.Qh7?
      • threat
        • 2.Sh5#
        • 2.Se6#
      • 1...Bd2+
        • 2.Bxd2#
      • 1...g2
        • 2.Sh5#
        • 2.Qh2#
      • 1...Bxc1!
    • 1.Qh8?
      • 1...Bd2+
        • 2.Bxd2#
      • 1...g2
        • 2.Qh2#
      • 1...g4
        • 2.Qh6#
      • 1...e4
        • 2.Qb8#
      • 1...Bxc1!
  • Keys
    • 1.Sh4!
      • threat
        • 2.Sg2#
        • 2.Sg6#
        • 2.Sh5#
        • 2.Se6#
      • 1...Bd2+
        • 2.Bxd2#
      • 1...Bxc1
        • 2.Sg2#
      • 1...gxh2
        • 2.Sh5#
      • 1...gxh4
        • 2.Qxh4#
      • 1...e4
        • 2.Sg6#
      • 1...g4
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(a);CHECK,OGATEB::B(A),XB(a)
    • P(f);OGATEB::QAB(C)
  • Tries
    • Try
      • Q(C);N_PINP(b)
      • Vars
        • B(a);CHECK,OGATEB::B(A),XB(a)
        • B(a);N_SPINB(a),OGATE,XB(A)::QAB(C),XB(a)
        • P(b);OGATEB::QAB(C)
        • P(f);OGATEB::QAB(C)
      • Refutation
        • P(e);
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • DUALS(3)
      • Vars
        • B(a);CHECK,OGATEB::B(A),XB(a)
      • Refutation
        • B(a);N_SPINB(a),XB(A)
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Refutation
        • P(f);XQ(C)
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAR1(C)
      • Vars
        • B(a);CHECK,OGATEB::B(A),XB(a)
      • Refutation
        • B(a);N_SPINB(a),XB(A)
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,OGATEB::B(A),XB(a)
      • Refutation
        • B(a);N_SPINB(a),XB(A)
    • Try
      • Q(C);N_PINP(b)
      • Vars
        • B(a);CHECK,OGATEB::B(A),XB(a)
        • P(b);OGATEB::QAB(C)
        • P(f);OGATEB::QAB(C)
        • P(e);OGATEB::QAB(C)
      • Refutation
        • B(a);N_SPINB(a),XB(A)
  • Actual
    • S(E);
    • Threat
      • DUALS(4)
    • Vars
      • B(a);CHECK,OGATEB::B(A),XB(a)
      • B(a);N_SPINB(a),XB(A)::S(E)
      • P(b);N_SPINP(b),XQ(C)::S(H)
      • P(f);OGATE,XS(E)::QAR2(C),XP(f)
      • P(e);::S(E)
      • P(f);::S(H)
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