MESON Chess Problem Database

Problem Display
PID: 234674 (1Nk5/r1P5/1QK5/2b5/8/8/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2009

1Nk5/r1P5/1QK5/2b5/8/8/8/8

#2

4 + 3

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.Qxa6#
    • 1...Rb7
      • 2.Qxb7#
    • 1...Rxc7+
      • 2.Qxc7#
    • 1...Ra8
      • 2.Qb7#
  • Tries
    • 1.Sa6?
      • threat
        • 2.Qb8#
      • 1...Rxc7+
        • 2.Qxc7#
      • 1...Rxa6
        • 2.Qxa6#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Ra8
        • 2.Qb7#
      • 1...Bxb6!
    • 1.Qb5?
      • 1...Ra6+
        • 2.Qxa6#
      • 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...Bg1
        • 2.Qf5#
      • 1...Bf2
        • 2.Qf5#
      • 1...Ba3
        • 2.Qf5#
      • 1...Be3
        • 2.Qf5#
      • 1...Bb4
        • 2.Qf5#
      • 1...Bd4
        • 2.Qf5#
      • 1...Bb6
        • 2.Qf5#
      • 1...Bd6
        • 2.Qf5#
      • 1...Be7
        • 2.Qf5#
      • 1...Bf8
        • 2.Qf5#
      • 1...Rxc7+!
    • 1.Qa6+?
      • 1...Rb7
        • 2.Qxb7#
      • 1...Rxa6+!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Qb8#
      • 1...Rxc7+
        • 2.Qxc7#
      • 1...Bxb6
        • 2.Sxb6#
      • 1...Ra6
        • 2.Qxa6#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Ra8
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(b);N_GUARD::QAB1(A)
    • R(b);N_GUARD,P_PINQ(A)::QAB(A),XR(b)
    • R(b);N_GUARD::QAB1(A),XR(b)
    • R(b);CHECK,OGATE,XP(C)::QAR1(A),XR(b)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAR1(A)
      • Vars
        • R(b);CHECK,OGATE,XP(C)::QAR1(A),XR(b)
        • R(b);OGATE,P_PINQ(A),XS(D)::QAB(A),XR(b)
        • R(b);N_GUARD::QAB1(A),XR(b)
        • R(b);N_GUARD::QAB1(A)
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);
      • Vars
        • R(b);CHECK,N_GUARD::QAB(A),XR(b)
        • R(b);N_GUARD::QAB1(A)
        • R(b);N_GUARD::QAB1(A),XR(b)
        • B(a);OGATE::QAB(A)
      • Refutation
        • R(b);CHECK,XP(C)
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(A),XR(b)
      • Refutation
        • R(b);CHECK,XQ(A)
  • Actual
    • S(D);
    • Threat
      • QAR1(A)
    • Vars
      • R(b);CHECK,OGATE,XP(C)::QAR1(A),XR(b)
      • B(a);XQ(A)::S(D),XB(a)
      • R(b);N_GUARD,P_PINQ(A)::QAB(A),XR(b)
      • R(b);N_GUARD::QAB1(A),XR(b)
      • R(b);N_GUARD::QAB1(A)
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