MESON Chess Problem Database

Problem Display
PID: 108868 (5n2/3N1K2/2b2P2/1pBk2pN/1PR5/2q1p3/4Q3/8 w - - 0 1)

Lenker, H

La Presse, 1896

5n2/3N1K2/2b2P2/1pBk2pN/1PR5/2q1p3/4Q3/8

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Rd4#
      • 2.Qd3#
    • 1...Qxb4
      • 2.Qd3#
    • 1...Qd4
      • 2.Rxd4#
    • 1...Qe5
      • 2.Sb6#
    • 1...Qxf6+
      • 2.Shxf6#
    • 1...Qc1
      • 2.Rd4#
      • 2.Qd3#
    • 1...Qc2
      • 2.Rd4#
    • 1...Qa3
      • 2.Rd4#
    • 1...Qb3
      • 2.Rd4#
    • 1...Qd3
      • 2.Qxd3#
    • 1...bxc4
      • 2.Qf3#
      • 2.Qg2#
    • 1...g4
      • 2.Sf4#
  • Tries
    • 1.Qd1+?
      • 1...Kxc4
        • 2.Sb6#
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Qd3
        • 2.Qxd3#
      • 1...Qd2!
    • 1.Qd3+?
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Qxd3!
    • 1.Qg4?
      • threat
        • 2.Qe4#
      • 1...Qxf6+
        • 2.Shxf6#
      • 1...Qxc4
        • 2.Qf5#
      • 1...bxc4
        • 2.Qf3#
        • 2.Qg2#
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Qe5
        • 2.Sb6#
      • 1...Qc2
        • 2.Rd4#
        • 2.Qd4#
      • 1...Qd3!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qe4#
      • 1...Qxf6+
        • 2.Shxf6#
      • 1...Kxc4
        • 2.Sb6#
      • 1...Qxc2
        • 2.Rd4#
      • 1...Qxc4
        • 2.Qf5#
      • 1...bxc4
        • 2.Qg2#
      • 1...Qd4
        • 2.Rxd4#
      • 1...Qe5
        • 2.Sb6#
      • 1...Qd3
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(a);N_GUARD,XP(B)::QAR2(A)
    • Q(a);N_GUARD::R1(C),XQ(a)
    • Q(a);SBLOCK::S(G)
    • Q(a);CHECK,XP(F)::S(E),XQ(a)
    • Q(a);N_GUARD::R1(C)
    • Q(a);N_GUARD::QAR2(A),XQ(a)
    • P(e);N_GUARD::S(E)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);S_FLIGHT,XR(C)::S(G)
        • Q(a);N_GUARD,P_SPINQ(a)::QAR2(A),XQ(a)
      • Refutation
        • Q(a);P_SPINQ(a)
    • Try
      • Q(A);CHECK
      • Refutation
        • Q(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • Q(a);CHECK,XP(F)::S(E),XQ(a)
        • Q(a);N_GUARD,SBLOCK,XR(C)::QAR2(A)
        • Q(a);SBLOCK::S(G)
      • Refutation
        • Q(a);
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(a);CHECK,XP(F)::S(E),XQ(a)
      • K(d);P_SPINQ(a),S_FLIGHT,XR(C)::S(G)
      • Q(a);N_GUARD,XQ(A)::R1(C)
      • Q(a);N_GUARD,SBLOCK,XR(C)::QAR2(A)
      • P(c);SBLOCK,XR(C)::QAB(A)
      • Q(a);N_GUARD::R1(C),XQ(a)
      • Q(a);SBLOCK::S(G)
      • Q(a);N_GUARD::QAR2(A),XQ(a)
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