MESON Chess Problem Database

Problem Display
PID: 179690 (7b/8/p1qn4/Bp2pN2/1nk1b2R/8/2B5/QK1R4 w - - 0 1)

Kopnin, Aleksey Grigorevich

2nd HM., Brubel JT, 1948

7b/8/p1qn4/Bp2pN2/1nk1b2R/8/2B5/QK1R4

#2

7 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc2
      • 2.Qc3#
  • Tries
    • 1.Sxd6+?
      • 1...Kc5
        • 2.Qc3#
      • 1...Qxd6!
    • 1.Qa4?
      • threat
        • 2.Qxb4#
      • 1...Kc3
        • 2.Qb3#
        • 2.Qxb4#
      • 1...Kc5
        • 2.Qxb4#
      • 1...Qc5
        • 2.Qb3#
      • 1...bxa4!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qxb4#
      • 1...Kc5
        • 2.Qxb4#
      • 1...Sxc2
        • 2.Qc3#
      • 1...Qc5
        • 2.Qb3#
      • 1...Sa2
        • 2.Se3#
      • 1...Sd3
        • 2.Bb3#
      • 1...Sd5
        • 2.Bd3#

There are these versions: 179711

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(a);XB(D)::QAR1(A)
  • Tries
    • Try
      • S(G);CHECK,XS(h)
      • Vars
        • K(b);N_SPINB(c),P-FLIGHT::QAR2(A)
      • Refutation
        • Q(g);XS(G)
    • Try
      • Q(A);P_PINS(a)
      • Threat
        • QAR1(A),XS(a)
      • Vars
        • K(b);N_SPINB(c),N_SPINS(a),P-FLIGHT::QAB1(A),XS(a)
        • Q(g);SBLOCK::QAB1(A)
      • Refutation
        • P(d);N_SPINS(a),XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XS(a)
    • Vars
      • K(b);N_SPINB(c),P-FLIGHT,P_SPINS(a)::QAB1(A),XS(a)
      • S(a);XB(D)::QAR1(A)
      • Q(g);SBLOCK::QAB1(A)
      • S(a);::S(G)
      • S(a);N_PINB(D)::B(D)
      • S(a);N_GUARD,SBLOCK::B(D)
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