MESON Chess Problem Database

Problem Display
PID: 180436 (1n6/b1P5/ppPp1N2/pPk1Bp2/K2p4/8/2P1QP2/2R5 w - - 0 1)

Lider, Valentin Viktorovich

2nd Comm., Schakend Nederland, 1974

1n6/b1P5/ppPp1N2/pPk1Bp2/K2p4/8/2P1QP2/2R5

#2

10 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.cxd3#
    • 1...axb5+
      • 2.Qxb5#
  • Tries
    • 1.bxa6?
      • threat
        • 2.Qb5#
      • 1...b5+
        • 2.Qxb5#
      • 1...Kxc6
        • 2.Qc4#
        • 2.c8Q#
        • 2.c8R#
      • 1...d3
        • 2.cxd3#
      • 1...dxe5!
    • 1.cxb8Q?
      • threat
        • 2.Bxd6#
        • 2.Qxd6#
      • 1...axb5+
        • 2.Qxb5#
      • 1...dxe5
        • 2.Qbxe5#
        • 2.Qf8#
      • 1...d3
        • 2.cxd3#
      • 1...d5
        • 2.Sd7#
        • 2.Bd6#
        • 2.Qd6#
        • 2.Qf8#
      • 1...Bxb8!
    • 1.c8Q?
      • 1...axb5+
        • 2.Qxb5#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...dxe5
        • 2.Qf8#
      • 1...d3
        • 2.cxd3#
      • 1...Sd7
        • 2.cxd7#
      • 1...d5
        • 2.Qf8#
      • 1...f4!
    • 1.c8S?
      • threat
        • 2.Bxd6#
      • 1...axb5+
        • 2.Qxb5#
      • 1...d3
        • 2.cxd3#
      • 1...d5
        • 2.Bd6#
      • 1...dxe5!
  • Keys
    • 1.c4!
      • 1...axb5+
        • 2.cxb5#
      • 1...Sxc6
        • 2.Sd7#
      • 1...dxe5
        • 2.Qxe5#
      • 1...dxc4 ep
        • 2.Rxc3#
      • 1...Sd7
        • 2.Sxd7#
      • 1...d3
        • 2.Qe3#
      • 1...f4
        • 2.Se4#
      • 1...d5
        • 2.cxd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATE::R(A)+P(B),XP(a)
    • P(e);CHECK,OGATE,XP(F)::QAR1(C),XP(e)
  • Tries
    • Try
      • P(F);XP(e)
      • Threat
        • QAR1(C)
      • Vars
        • P(f);CHECK::QAR1(C),XP(f)
        • P(a);OGATE::R(A)+P(B),XP(a)
      • Refutation
        • P(g);XB(G)
    • Try
      • P(J);XS(i)
      • Threat
        • DUALS(2)
      • Vars
        • P(e);CHECK,OGATE,XP(F)::QAR1(C),XP(e)
        • P(a);OGATE::R(A)+P(B),XP(a)
      • Refutation
        • B(h);XQ(J)
    • Try
      • P(J);
      • Vars
        • P(e);CHECK,OGATE,XP(F)::QAR1(C),XP(e)
        • S(i);OGATE,P_SPINS(i),XP(H)::QAR1(J),XS(i)
        • P(g);OGATEB,XB(G)::QAB(J)
        • P(a);OGATE::R(A)+P(B),XP(a)
        • S(i);OGATE::QAR(J)+P(H),XS(i)
        • P(g);OGATEB::QAB(J)
      • Refutation
        • P(d);
    • Try
      • P(J);
      • Threat
        • B(G),XP(g)
      • Vars
        • P(e);CHECK,OGATE,XP(F)::QAR1(C),XP(e)
        • P(a);OGATE::R(A)+P(B),XP(a)
        • P(g);::B(G)
      • Refutation
        • P(g);XB(G)
  • Actual
    • P(B);
    • Vars
      • P(e);CHECK,OGATE,XP(F)::R(A)+P(B),XP(e)
      • S(i);N_GUARD,XP(H)::S(I)
      • P(g);OGATE,XB(G)::QAR2(C),XP(g)
      • P(a);EP,OGATEB,P_SPINP(a),XP(B)::R(A),XP(a)
      • S(i);N_GUARD::S(I),XS(i)
      • P(a);OGATEB::QAB(C)
      • P(d);N_GUARD::S(I)
      • P(g);OGATE::R(A)+P(B),XP(g)
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