MESON Chess Problem Database

Problem Display
PID: 170490 (8/8/8/8/8/2nK4/4p1Q1/4krR1 w - - 0 1)

Braun, Georges

Basler Nachrichten, 1976

8/8/8/8/8/2nK4/4p1Q1/4krR1

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg1
      • 2.Qxg1#
    • 1...Sb1
      • 2.Qxe2#
    • 1...Sd1
      • 2.Qxe2#
    • 1...Sa2
      • 2.Qxe2#
    • 1...Sa4
      • 2.Qxe2#
    • 1...Se4
      • 2.Qxe2#
    • 1...Sb5
      • 2.Qxe2#
    • 1...Sd5
      • 2.Qxe2#
  • Tries
    • 1.Kxc3?
      • 1...Rxg1
        • 2.Qxg1#
      • 1...Kd1!
    • 1.Qf3?
      • 1...Kd1
        • 2.Rxf1#
      • 1...Sb1
        • 2.Qxe2#
      • 1...Sd1
        • 2.Qxe2#
      • 1...Sa2
        • 2.Qxe2#
      • 1...Sa4
        • 2.Qxe2#
      • 1...Se4
        • 2.Qxe2#
      • 1...Sb5
        • 2.Qxe2#
      • 1...Sd5
        • 2.Qxe2#
      • 1...Rxg1!
    • 1.Qh2?
      • 1...Rxg1
        • 2.Qxg1#
      • 1...Sb1
        • 2.Qxe2#
      • 1...Sd1
        • 2.Qxe2#
      • 1...Sa2
        • 2.Qxe2#
      • 1...Sa4
        • 2.Qxe2#
      • 1...Se4
        • 2.Qxe2#
      • 1...Sb5
        • 2.Qxe2#
      • 1...Sd5
        • 2.Qxe2#
      • 1...Kd1!
  • Keys
    • 1.Qg4!
      • 1...Kd1
        • 2.Rxf1#
      • 1...Kf2
        • 2.Qg3#
      • 1...Rxg1
        • 2.Qxg1#
      • 1...Sb1
        • 2.Qxe2#
      • 1...Sd1
        • 2.Qxe2#
      • 1...Sa2
        • 2.Qxe2#
      • 1...Sa4
        • 2.Qxe2#
      • 1...Se4
        • 2.Qxe2#
      • 1...Sb5
        • 2.Qxe2#
      • 1...Sd5
        • 2.Qxe2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(B),XR(b)
    • S(d);N_GUARD::QAR1(B),XP(c)
  • Tries
    • Try
      • K(C);P-FLIGHT,XS(d)
      • Vars
        • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(B),XR(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);P-FLIGHT,P_SPINP(c)::R(A),XR(b)
        • S(d);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • R(b);N_SPINR(b),XR(A)
    • Try
      • Q(B);
      • Vars
        • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(B),XR(b)
        • S(d);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT,P_SPINP(c)::R(A),XR(b)
      • K(a);N_SPINR(b),S_FLIGHT::QAB1(B)
      • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(B),XR(b)
      • S(d);N_GUARD::QAR1(B),XP(c)
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