MESON Chess Problem Database

Problem Display
PID: 92259 (1Q6/rN1P4/k7/2P5/2K5/8/8/8 w - - 0 1)

Ferber, Eugene

Deutsche Schachzeitung, 1905

1Q6/rN1P4/k7/2P5/2K5/8/8/8

#2

5 + 2

6490 yacpdb 2009
3713 Snap 2019
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxa8#
  • Tries
    • 1.Kb4?
      • 1...Ra8
        • 2.Qxa8#
      • 1...Rxb7+!
    • 1.Sa5?
      • threat
        • 2.Qb5#
        • 2.Qb6#
      • 1...Kxa5
        • 2.Qxa7#
        • 2.Qb5#
      • 1...Rxd7
        • 2.Qb6#
      • 1...Rc7
        • 2.Qb6#
      • 1...Ra8
        • 2.Qb6#
        • 2.Qxa8#
      • 1...Rb7!
    • 1.Sd6?
      • threat
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ka5
        • 2.Qxa7#
        • 2.Qb5#
      • 1...Rxd7
        • 2.Qb6#
      • 1...Rc7
        • 2.Qb6#
      • 1...Ra8
        • 2.Qb6#
        • 2.Qxa8#
      • 1...Rb7!
    • 1.Sd8?
      • threat
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ka5
        • 2.Qxa7#
        • 2.Qb5#
      • 1...Rxd7
        • 2.Qb6#
      • 1...Rc7
        • 2.Qb6#
      • 1...Ra8
        • 2.Qb6#
        • 2.Qxa8#
      • 1...Rb7!
    • 1.Qc7?
      • threat
        • 2.Qb6#
        • 2.Qc6#
      • 1...Ra8
        • 2.Qb6#
      • 1...Rxb7!
    • 1.Qc8?
      • threat
        • 2.Qc6#
      • 1...Ra8
        • 2.Qxa8#
      • 1...Rxb7!
    • 1.Qd8?
      • threat
        • 2.Qb6#
      • 1...Kxb7
        • 2.Qc8#
      • 1...Rxb7!
    • 1.Qe8?
      • 1...Kxb7
        • 2.Qc8#
      • 1...Ra8
        • 2.Qxa8#
      • 1...Rxb7!
    • 1.Qf8?
      • 1...Kxb7
        • 2.Qc8#
      • 1...Ra8
        • 2.Qxa8#
      • 1...Rxb7!
    • 1.Qg8?
      • 1...Kxb7
        • 2.Qc8#
      • 1...Ra8
        • 2.Qxa8#
      • 1...Rxb7!
    • 1.d8S?
      • threat
        • 2.Qd6#
      • 1...Ra8
        • 2.Qxa8#
      • 1...Rxb7!
    • 1.d8B?
      • 1...Ra8
        • 2.Qxa8#
      • 1...Rxb7!
  • Keys
    • 1.Qh8!
      • 1...Kxb7
        • 2.Qc8#
      • 1...Rxb7
        • 2.Qa1#
      • 1...Ra8
        • 2.Qxa8#

This anticipates 190048(1913), 118733(1959)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);OGATEB::QAR2(E),XR(b)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • R(b);OGATEB::QAR2(E),XR(b)
      • Refutation
        • R(b);CHECK,XS(C)
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(D)::QAR1(E)
        • R(b);P_PINP(B)::QAR1(E)
      • Refutation
        • R(b);
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(D)::QAR1(E)
        • R(b);P_PINP(B)::QAR1(E)
      • Refutation
        • R(b);
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(D)::QAR1(E)
        • R(b);P_PINP(B)::QAR1(E)
      • Refutation
        • R(b);
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);::QAR1(E)
      • Refutation
        • R(b);XS(C)
    • Try
      • Q(E);
      • Threat
        • QAR2(E)
      • Vars
        • R(b);OGATEB::QAR2(E),XR(b)
      • Refutation
        • R(b);P_SPINR(b),XS(C)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
      • Refutation
        • R(b);XS(C)
    • Try
      • Q(E);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
        • R(b);OGATEB::QAR2(E),XR(b)
      • Refutation
        • R(b);XS(C)
    • Try
      • Q(E);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
        • R(b);OGATEB::QAR2(E),XR(b)
      • Refutation
        • R(b);XS(C)
    • Try
      • Q(E);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
        • R(b);OGATEB::QAR2(E),XR(b)
      • Refutation
        • R(b);XS(C)
    • Try
      • P(D);
      • Threat
        • QAR(E)
      • Vars
        • R(b);OGATEB::QAR2(E),XR(b)
      • Refutation
        • R(b);XS(C)
    • Try
      • P(D);
      • Vars
        • R(b);OGATEB::QAR2(E),XR(b)
      • Refutation
        • R(b);XS(C)
  • Actual
    • Q(E);
    • Vars
      • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
      • R(b);SBLOCK,XS(C)::QAR(E)
      • R(b);OGATEB::QAR2(E),XR(b)
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