MESON Chess Problem Database

Problem Display
PID: 252346 (r3k1nr/1pp3Qn/3PP1KB/2P5/q3p3/3p4/2b5/R7 w kq - 0 1)

Labai, Zoltan

Svitek, Miroslav

Best Problems, 2021

r3k1nr/1pp3Qn/3PP1KB/2P5/q3p3/3p4/2b5/R7

#2

7 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Rxa8#
      • 2.Qd7#
    • 1...Qb5
      • 2.Rxa8#
    • 1...Qc6
      • 2.Rxa8#
    • 1...Qd7
      • 2.Qxd7#
    • 1...Qxa1
      • 2.Qd7#
    • 1...Qa2
      • 2.Qd7#
    • 1...Qa3
      • 2.Qd7#
    • 1...Qb4
      • 2.Rxa8#
      • 2.Qd7#
    • 1...Qc4
      • 2.Rxa8#
      • 2.Qd7#
    • 1...Qd4
      • 2.Rxa8#
      • 2.Qd7#
    • 1...Qa5
      • 2.Qd7#
    • 1...Qa6
      • 2.Qd7#
    • 1...Qa7
      • 2.Qd7#
    • 1...Rd8
      • 2.Qf7#
    • 1...Sg5
      • 2.Qf8#
    • 1...Shf6
      • 2.Qf8#
    • 1...Sf8+
      • 2.Qxf8#
    • 1...Sgf6
      • 2.Qe7#
    • 1...Sxh6
      • 2.Qe7#
    • 1...Se7+
      • 2.Qxe7#
    • 1...b5
      • 2.Qd7#
    • 1...c6
      • 2.Qd7#
    • 1...0-0-0
      • 2.Qxc7#
  • Tries
    • 1.Rxa4?
      • threat
        • 2.Rxa8#
        • 2.Qd7#
      • 1...Sf8+
        • 2.Qxf8#
      • 1...Se7+
        • 2.Qxe7#
      • 1...Kd8
        • 2.Rxa8#
        • 2.Qd7#
      • 1...0-0-0
        • 2.Ra8#
        • 2.Qxc7#
      • 1...Rxa4
        • 2.Qd7#
      • 1...Sxh6
        • 2.Rxa8#
        • 2.Qe7#
      • 1...Ra5
        • 2.Qd7#
      • 1...Ra6
        • 2.Qd7#
      • 1...Ra7
        • 2.Qd7#
      • 1...Rb8
        • 2.Qd7#
      • 1...Rc8
        • 2.Qd7#
      • 1...Rd8
        • 2.Qf7#
      • 1...Shf6
        • 2.Rxa8#
        • 2.Qf8#
      • 1...Sgf6
        • 2.Rxa8#
        • 2.Qe7#
      • 1...Bxa4!
    • 1.d7+?
      • 1...Qxd7
        • 2.Qxd7#
      • 1...Kd8!
  • Keys
    • 1.c6!
      • threat
        • 2.Qd7#
      • 1...Sf8+
        • 2.Qxf8#
      • 1...Se7+
        • 2.Qxe7#
      • 1...Kd8
        • 2.Qd7#
      • 1...0-0-0
        • 2.Qxc7#
      • 1...Qxc6
        • 2.Rxa8#
      • 1...Sxh6
        • 2.Qe7#
      • 1...Rd8
        • 2.Qf7#
      • 1...Shf6
        • 2.Qf8#
      • 1...Sgf6
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 11
  • Sets
    • Q(c);OGATE::R(A),XR(h)
    • Q(c);N_GUARD::QAB1(G),XQ(c)
    • Q(c);N_GUARD,XR(A)::QAB1(G)
    • Q(c);N_GUARD::QAB1(G)
    • R(h);SBLOCK::QAB1(G)
    • S(g);N_GUARD::QAR1(G)
    • S(g);CHECK,N_GUARD::QAR1(G),XS(g)
    • S(j);N_GUARD::QAR1(G)
    • S(j);N_GUARD,XB(F)::QAR1(G)
    • S(j);CHECK,N_GUARD::QAR1(G),XS(j)
    • P(e);S_CUTQ(c)::QAB1(G)
    • P(f);S_CUTQ(c)::QAB1(G)
    • K(i);0-0-0,OGATEB::QAR1(G),XP(f)
  • Tries
    • Try
      • R(A);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(g);CHECK,N_GUARD::QAR1(G),XS(g)
        • S(j);CHECK,N_GUARD::QAR1(G),XS(j)
        • R(h);XR(A)::QAB1(G)
        • R(h);::QAB1(G)
        • R(h);SBLOCK::QAB1(G)
      • Refutation
        • B(a);XR(A)
    • Try
      • P(C);CHECK
      • Vars
        • Q(c);OGATE,XP(C)::QAB1(G),XQ(c)
      • Refutation
        • K(i);P-FLIGHT
  • Actual
    • P(B);
    • Threat
      • QAB1(G)
    • Vars
      • S(g);CHECK,N_GUARD::QAR1(G),XS(g)
      • S(j);CHECK,N_GUARD::QAR1(G),XS(j)
      • K(i);P-FLIGHT::QAR1(G)
      • K(i);0-0-0,OGATEB::QAR1(G),XP(f)
      • Q(c);OGATE,XP(B)::R(A),XR(h)
      • S(j);N_GUARD,XB(F)::QAR1(G)
      • R(h);SBLOCK::QAB1(G)
      • S(g);N_GUARD::QAR1(G)
      • S(j);N_GUARD::QAR1(G)
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