MESON Chess Problem Database

Problem Display
PID: 234614 (Kb6/1R6/k3p3/8/8/r7/8/3Q4 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2003

Kb6/1R6/k3p3/8/8/r7/8/3Q4

#2

3 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxa1#
    • 1...Rc3
      • 2.Qa4#
    • 1...Rd3
      • 2.Qa4#
    • 1...Re3
      • 2.Qa4#
    • 1...Rf3
      • 2.Qa4#
    • 1...Rg3
      • 2.Qa4#
    • 1...Rh3
      • 2.Qa4#
    • 1...Ra4
      • 2.Qxa4#
  • Tries
    • 1.Qe2+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Rd3!
    • 1.Qb3?
      • threat
        • 2.Qxa3#
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ka5
        • 2.Qxa3#
        • 2.Qb5#
      • 1...Ra2
        • 2.Qxa2#
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ra1
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ra4
        • 2.Qxa4#
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ra5
        • 2.Rb6#
        • 2.Qb6#
      • 1...Bd6
        • 2.Ra7#
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ba7
        • 2.Rxa7#
        • 2.Qxa3#
        • 2.Qb5#
      • 1...Bc7
        • 2.Ra7#
        • 2.Qb5#
      • 1...Rxb3!
    • 1.Qb1?
      • threat
        • 2.Qb5#
        • 2.Qb6#
      • 1...Ka5
        • 2.Qb5#
      • 1...Ra5
        • 2.Rb6#
        • 2.Qb6#
      • 1...Ba7
        • 2.Rxa7#
        • 2.Qb5#
      • 1...Bc7
        • 2.Ra7#
        • 2.Qb5#
      • 1...Rb3!
    • 1.Qf1+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Rd3!
    • 1.Qd3+?
      • 1...Ka5
        • 2.Qb5#
        • 2.Qxa3#
      • 1...Rxd3!
    • 1.Qd4?
      • threat
        • 2.Qb6#
      • 1...Rb3
        • 2.Qa4#
      • 1...Ba7
        • 2.Qxa7#
      • 1...Bc7
        • 2.Qa7#
      • 1...Ka5!
    • 1.Qd6+?
      • 1...Ka5
        • 2.Qxa3#
      • 1...Bxd6!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qb5#
      • 1...Ka5
        • 2.Qb5#
      • 1...Rb3
        • 2.Qa4#
      • 1...Ra5
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • R(a);OGATEB::QAR(A),XR(a)
    • R(a);N_GUARD::QAR2(A)
    • R(a);N_GUARD::QAR2(A),XR(a)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • R(a);P_SPINR(a)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Refutation
        • R(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • R(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • R(a);P_SPINR(a)
    • Try
      • Q(A);CHECK
      • Refutation
        • R(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • R(a);N_GUARD::QAR2(A)
        • B(d);N_GUARD::QAR1(A),XB(d)
        • B(d);N_GUARD::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(A),XR(a)
      • Refutation
        • B(d);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(b);P-FLIGHT::QAR1(A)
      • R(a);N_GUARD::QAR2(A)
      • R(a);SBLOCK::QAR2(A)
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