MESON Chess Problem Database

Problem Display
PID: 234444 (2Qr4/8/8/7p/6R1/7k/8/3R3K w - - 0 1)

Lincoln, Robert A

Kudesnik, 2010

2Qr4/8/8/7p/6R1/7k/8/3R3K

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Rxd3#
    • 1...Rg8
      • 2.Rd3#
    • 1...Rh8
      • 2.Rd3#
  • Tries
    • 1.Rg3+?
      • 1...Kh4
        • 2.Qh3#
      • 1...Kxg3!
    • 1.Ra4+?
      • 1...Rd7
        • 2.Rd3#
      • 1...Rxc8
        • 2.Rd3#
      • 1...Kg3!
    • 1.Rb4+?
      • 1...Rd7
        • 2.Rd3#
      • 1...Rxc8
        • 2.Rd3#
      • 1...Kg3!
    • 1.Rc4+?
      • 1...Rd7
        • 2.Rd3#
      • 1...Rxc8
        • 2.Rd3#
      • 1...Kg3!
    • 1.Rgd4+?
      • 1...Rd7
        • 2.R1d3#
        • 2.Qc3#
      • 1...Rxc8
        • 2.R1d3#
      • 1...Kg3!
    • 1.Re4+?
      • 1...Rd7
        • 2.Rd3#
      • 1...Rxc8
        • 2.Rd3#
      • 1...Kg3!
    • 1.Rf4+?
      • 1...Rd7
        • 2.Rd3#
      • 1...Rxc8
        • 2.Rd3#
      • 1...Kg3!
  • Keys
    • 1.Rdg1!
      • threat
        • 2.R1g3#
      • 1...hxg4
        • 2.Qxg4#
      • 1...Rd1
        • 2.Rd4#
      • 1...Rd3
        • 2.Rd4#
      • 1...h4
        • 2.R4g3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(c);N_GUARD::R(A),XR(c)
    • R(c);N_GUARD::R(A)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT,XR(C)
    • Try
      • R(C);CHECK
      • Vars
        • R(c);P_SPINR(c)::R(A)
        • R(c);XQ(D)::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • R(c);P_SPINR(c)::R(A)
        • R(c);XQ(D)::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • R(c);P_SPINR(c)::R(A)
        • R(c);XQ(D)::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • R(c);XQ(D)::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • R(c);P_SPINR(c)::R(A)
        • R(c);XQ(D)::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • R(c);P_SPINR(c)::R(A)
        • R(c);XQ(D)::R(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • R(A);
    • Threat
      • R1(A)
    • Vars
      • P(b);OGATE,P_SPINP(b),XR(C)::QAB1(D),XP(b)
      • R(c);N_GUARD,P_PINR(A)::QAB(D)+R(C)
      • R(c);N_GUARD::QAB(D)+R(C)
      • P(b);SBLOCK::QAB(D)+R(C),DCHECK
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