MESON Chess Problem Database

Problem Display
PID: 232378 (2k2n2/r1P5/2Q5/2N4K/8/8/8/8 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1979

2k2n2/r1P5/2Q5/2N4K/8/8/8/8

#2

4 + 3

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qb7#
    • 1...Ra2
      • 2.Qb7#
    • 1...Ra3
      • 2.Qb7#
    • 1...Ra4
      • 2.Qb7#
    • 1...Ra5
      • 2.Qb7#
    • 1...Ra6
      • 2.Qb7#
    • 1...Rb7
      • 2.Qxb7#
    • 1...Rxc7
      • 2.Qa8#
      • 2.Qe8#
    • 1...Ra8
      • 2.Qb7#
    • 1...Se6
      • 2.Qd7#
    • 1...Sg6
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
    • 1...Sh7
      • 2.Qd7#
  • Tries
    • 1.Kg4?
      • 1...Rxc7
        • 2.Qa8#
        • 2.Qe8#
      • 1...Ra1
        • 2.Qb7#
      • 1...Ra2
        • 2.Qb7#
      • 1...Ra3
        • 2.Qb7#
      • 1...Ra5
        • 2.Qb7#
      • 1...Ra6
        • 2.Qb7#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Ra8
        • 2.Qb7#
      • 1...Se6
        • 2.Qd7#
      • 1...Sg6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sh7
        • 2.Qd7#
      • 1...Ra4+!
    • 1.Kh6?
      • 1...Rxc7
        • 2.Qa8#
        • 2.Qe8#
      • 1...Ra1
        • 2.Qb7#
      • 1...Ra2
        • 2.Qb7#
      • 1...Ra3
        • 2.Qb7#
      • 1...Ra4
        • 2.Qb7#
      • 1...Ra5
        • 2.Qb7#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Ra8
        • 2.Qb7#
      • 1...Se6
        • 2.Qd7#
      • 1...Sg6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sh7
        • 2.Qd7#
      • 1...Ra6!
    • 1.Qb5?
      • threat
        • 2.Qb8#
      • 1...Rxc7
        • 2.Qe8#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Ra8
        • 2.Qb7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Kxc7!
    • 1.Qd5?
      • threat
        • 2.Qd8#
      • 1...Rxc7
        • 2.Qa8#
      • 1...Se6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Kxc7!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qd8#
      • 1...Rxc7
        • 2.Qxf8#
      • 1...Se6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#

Anticipated by 10500(1965)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • R(a);N_GUARD::QAB1(C)
    • R(a);N_GUARD,P_PINS(A)::QAB1(C)
    • R(a);N_GUARD::QAB1(C),XR(a)
    • S(c);N_GUARD::QAB1(C)
    • S(c);N_GUARD::QAB1(C),XS(c)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • R(a);N_GUARD::QAB1(C)
        • R(a);N_GUARD::QAB1(C),XR(a)
        • S(c);N_GUARD::QAB1(C)
        • S(c);N_GUARD::QAB1(C),XS(c)
      • Refutation
        • R(a);CHECK
    • Try
      • K(B);P-FLIGHT
      • Vars
        • R(a);N_GUARD::QAB1(C)
        • R(a);N_GUARD::QAB1(C),XR(a)
        • S(c);N_GUARD::QAB1(C)
        • S(c);N_GUARD::QAB1(C),XS(c)
      • Refutation
        • R(a);P_PINQ(C)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • R(a);SBLOCK,XP(D)::QAR2(C)
        • R(a);N_GUARD::QAB1(C),XR(a)
        • R(a);N_GUARD::QAB1(C)
        • S(c);N_GUARD::QAB1(C),XS(c)
      • Refutation
        • K(b);P-FLIGHT,XP(D)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • R(a);N_GUARD,SBLOCK,XP(D)::QAR2(C)
        • S(c);N_GUARD::QAB1(C)
        • S(c);N_GUARD::QAB1(C),XS(c)
      • Refutation
        • K(b);P-FLIGHT,XP(D)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • R(a);SBLOCK,XP(D)::QAR(C),XS(c)
      • S(c);N_GUARD::QAB1(C)
      • S(c);N_GUARD::QAB1(C),XS(c)
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