MESON Chess Problem Database

Problem Display
PID: 234649 (3Q4/8/p1p5/8/k7/1R6/1bK5/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2006

3Q4/8/p1p5/8/k7/1R6/1bK5/8

#2

3 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Kxb2?
      • 1...a5
        • 2.Qh4#
        • 2.Qd4#
      • 1...c5!
    • 1.Rb4+?
      • 1...Ka3
        • 2.Qa5#
      • 1...Kxb4!
    • 1.Qh4+?
      • 1...Ka5
        • 2.Qb4#
      • 1...Bd4!
    • 1.Qb6?
      • threat
        • 2.Qb4#
        • 2.Qxa6#
      • 1...Ba3
        • 2.Qxa6#
      • 1...a5
        • 2.Qxc6#
      • 1...c5
        • 2.Qxa6#
      • 1...Bc3!
    • 1.Qd4+?
      • 1...Ka5
        • 2.Qb4#
      • 1...Bxd4!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qb4#
      • 1...Ka5
        • 2.Qb4#
      • 1...Ba3
        • 2.Qxa3#
      • 1...Bc3
        • 2.Qa3#
      • 1...a5
        • 2.Qxc6#
      • 1...c5
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(A);P-FLIGHT,XB(a)
      • Refutation
        • P(d);
    • Try
      • R(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT,XR(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(C)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAR2(C),XP(c)
        • P(c);SBLOCK::QAB(C),XP(d)
        • P(d);::QAR2(C),XP(c)
      • Refutation
        • B(a);
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(C)
      • Refutation
        • B(a);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • K(b);P-FLIGHT::QAB1(C)
      • B(a);N_GUARD::QAR1(C),XB(a)
      • B(a);N_GUARD::QAR1(C)
      • P(c);SBLOCK::QAB(C),XP(d)
      • P(d);OGATE::QAR2(C),XP(c)
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