MESON Chess Problem Database

Problem Display
PID: 103647 (4n3/Kp2N3/pp2N3/rk6/3Q1p1r/1p6/3R4/4Bb1q w - - 0 1)

Lukyanov, Valentin Volodimirovich

Vecherni Moskva, 1975

4n3/Kp2N3/pp2N3/rk6/3Q1p1r/1p6/3R4/4Bb1q

#2

6 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd6
      • 2.Sc7#
    • 1...Sf6
      • 2.Sc7#
    • 1...Sc7
      • 2.Sxc7#
    • 1...Sg7
      • 2.Sc7#
    • 1...b2
      • 2.Rxb2#
  • Tries
    • 1.Ra2?
      • threat
        • 2.Qb4#
      • 1...Ra4
        • 2.Qxa4#
      • 1...Bc4
        • 2.Qxb6#
      • 1...f3
        • 2.Qd5#
      • 1...Qe4!
    • 1.Rc2?
      • threat
        • 2.Qb4#
      • 1...Bc4
        • 2.Qxc4#
      • 1...Ra4
        • 2.Qxb6#
      • 1...f3
        • 2.Qd7#
      • 1...Qe4!
    • 1.Rd3?
      • threat
        • 2.Rxb3#
        • 2.Qb4#
      • 1...Bxd3
        • 2.Qb4#
      • 1...Qe4
        • 2.Rxb3#
      • 1...Qf3
        • 2.Qb4#
      • 1...Qd5
        • 2.Qb4#
      • 1...Qh3
        • 2.Qb4#
      • 1...Rh3
        • 2.Qb4#
      • 1...Ra3
        • 2.Qb4#
      • 1...b2
        • 2.Rb3#
        • 2.Qb4#
      • 1...f3
        • 2.Rxb3#
      • 1...Ra4!
    • 1.Qxb6+?
      • 1...Kc4
        • 2.Rd4#
      • 1...Ka4!
  • Keys
    • 1.Rg2!
      • threat
        • 2.Qb4#
      • 1...Bc4
        • 2.Qd7#
      • 1...Ra4
        • 2.Qd5#
      • 1...f3
        • 2.Rg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(k);N_GUARD::S(D)
    • S(k);N_GUARD::S(D),XS(k)
    • P(c);OGATEB::R(B),XP(c)
  • Tries
    • Try
      • R(B);
      • Threat
        • QAR1(C)
      • Vars
        • R(f);N_GUARD::QAB1(C),XR(f)
        • B(a);SBLOCK::QAR1(C),XP(i)
        • P(d);S_CUTQ(b)::QAR2(C)
      • Refutation
        • Q(b);
    • Try
      • R(B);
      • Threat
        • QAR1(C)
      • Vars
        • B(a);N_GUARD::QAB1(C),XB(a)
        • R(f);SBLOCK::QAR1(C),XP(i)
        • P(d);S_CUTQ(b)::QAB(C)
      • Refutation
        • Q(b);
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XR(B)::QAR1(C)
        • Q(b);::R(B),XP(c)
        • Q(b);::QAR1(C)
        • R(e);::QAR1(C)
        • R(f);::QAR1(C)
        • P(d);::R(B),XP(c)
      • Refutation
        • R(f);
    • Try
      • Q(C);CHECK,XP(i)
      • Vars
        • K(g);S_FLIGHT::R1(B)
      • Refutation
        • K(g);S_FLIGHT
  • Actual
    • R(B);
    • Threat
      • QAR1(C)
    • Vars
      • B(a);SBLOCK::QAB(C)
      • R(f);SBLOCK::QAR2(C)
      • P(d);S_CUTQ(b)::R(B)
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