MESON Chess Problem Database

Problem Display
PID: 219464 (8/3R4/2Q5/r3k1K1/8/6P1/4n3/8 w - - 0 1)

Prokubek, Harald

Schach-Report, 1990

8/3R4/2Q5/r3k1K1/8/6P1/4n3/8

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qd5#
    • 1...Ra2
      • 2.Qd5#
    • 1...Ra3
      • 2.Qd5#
    • 1...Ra4
      • 2.Qd5#
    • 1...Rd5
      • 2.Qxd5#
    • 1...Ra6
      • 2.Qd5#
    • 1...Ra7
      • 2.Qd5#
    • 1...Ra8
      • 2.Qd5#
    • 1...Sf4
      • 2.gxf4#
  • Tries
    • 1.Rd1?
      • threat
        • 2.Qe8#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Ra6
        • 2.Qd5#
      • 1...Ra7
        • 2.Qd5#
      • 1...Ra8
        • 2.Qd5#
      • 1...Sf4
        • 2.gxf4#
      • 1...Sd4!
    • 1.Rd2?
      • threat
        • 2.Qe8#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Ra6
        • 2.Qd5#
      • 1...Ra7
        • 2.Qd5#
      • 1...Ra8
        • 2.Qd5#
      • 1...Sf4
        • 2.gxf4#
      • 1...Sd4!
    • 1.Rd8?
      • threat
        • 2.Qe8#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Ra6
        • 2.Qd5#
      • 1...Ra7
        • 2.Qd5#
      • 1...Sf4
        • 2.gxf4#
      • 1...Sd4!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Qe8#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sd4
        • 2.Re3#
      • 1...Ra6
        • 2.Qd5#
      • 1...Ra7
        • 2.Qd5#
      • 1...Ra8
        • 2.Qd5#
      • 1...Sf4
        • 2.gxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(b);N_GUARD::QAR1(C)
    • R(b);N_GUARD::QAR1(C),XR(b)
    • S(a);OGATE::P(A),XS(a)
  • Tries
    • Try
      • R(D);
      • Threat
        • QAR(C)
      • Vars
        • R(b);N_GUARD::QAR1(C),XR(b)
        • R(b);N_GUARD::QAR1(C)
        • S(a);OGATE::P(A),XS(a)
      • Refutation
        • S(a);
    • Try
      • R(D);
      • Threat
        • QAR(C)
      • Vars
        • R(b);N_GUARD::QAR1(C),XR(b)
        • R(b);N_GUARD::QAR1(C)
        • S(a);OGATE::P(A),XS(a)
      • Refutation
        • S(a);
    • Try
      • R(D);
      • Threat
        • QAR(C)
      • Vars
        • R(b);N_GUARD::QAR1(C),XR(b)
        • R(b);N_GUARD::QAR1(C)
        • S(a);OGATE::P(A),XS(a)
      • Refutation
        • S(a);
  • Actual
    • R(D);
    • Threat
      • QAR(C)
    • Vars
      • R(b);N_GUARD::QAR1(C),XR(b)
      • S(a);SBLOCK::R(D)
      • R(b);N_GUARD::QAR1(C)
      • S(a);OGATE::P(A),XS(a)
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