MESON Chess Problem Database

Problem Display
PID: 16787 (2B5/8/8/4Q2b/1R3Rq1/4N1kP/8/6K1 w - - 0 1)

Spencer, George Burt

1st Prize, Chess Review (Decalet Ty.), 1943

2B5/8/8/4Q2b/1R3Rq1/4N1kP/8/6K1

#2

7 + 3

5088 How to Solve Chess Problems 1945
5064 100 Years of the American Two-move Chess Problem 1962

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1+
      • 2.Rf1#
    • 1...Qe2
      • 2.Rf1#
      • 2.Rf2#
      • 2.Rf6#
      • 2.Rf7#
      • 2.Rf8#
    • 1...Qxh3
      • 2.Rf1#
      • 2.Rf2#
      • 2.Rf5#
      • 2.Rf6#
      • 2.Rf7#
      • 2.Rf8#
    • 1...Qxf4
      • 2.Qxf4#
    • 1...Qh4
      • 2.Sf1#
    • 1...Qg5
      • 2.Sf1#
    • 1...Qg6
      • 2.Sf1#
      • 2.Rf1#
      • 2.Rf2#
      • 2.Rf6#
      • 2.Rf7#
      • 2.Rf8#
    • 1...Qg7
      • 2.Sf1#
      • 2.Rf6#
    • 1...Qg8
      • 2.Sf1#
      • 2.Rf1#
      • 2.Rf2#
      • 2.Rf6#
      • 2.Rf7#
      • 2.Rf8#
  • Tries
    • 1.Rf3+?
      • 1...Kh4+
        • 2.Sg2#
      • 1...Kxf3+!
    • 1.Rxg4+?
      • 1...Kxh3
        • 2.Rg3#
        • 2.Rh4#
        • 2.Qh2#
        • 2.Qg3#
        • 2.Qxh5#
      • 1...Kf3!
    • 1.Qc3?
      • threat
        • 2.Sf5#
      • 1...Kxh3+
        • 2.Sg2#
      • 1...Qd1+
        • 2.Sf1#
      • 1...Qf3
        • 2.Sf1#
      • 1...Qf5
        • 2.Sf1#
        • 2.Sxf5#
      • 1...Kh4+!
    • 1.Qg5?
      • 1...Qxg5
        • 2.Sf1#
      • 1...Bg6
        • 2.Qxg4#
      • 1...Bf7
        • 2.Qxg4#
      • 1...Be8
        • 2.Qxg4#
      • 1...Kxh3+!
  • Keys
    • 1.Rb3!
      • threat
        • 2.Sf5#
      • 1...Kxh3+
        • 2.Sg2#
      • 1...Kh4+
        • 2.Sg2#
      • 1...Qd1+
        • 2.Sf1#
      • 1...Qf3
        • 2.Sf1#
      • 1...Qf5
        • 2.Sf1#
        • 2.Sxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(b);CHECK,N_GUARD::QAB(F)+R(E)
    • Q(b);OGATE,P_SPINQ(b),XR(E)::QAB1(F),XQ(b)
    • Q(b);::S(B)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(a);CHECK,P_SPINQ(b),S_FLIGHT::S(B)
      • Refutation
        • K(a);CHECK,P-FLIGHT,XR(E)
    • Try
      • R(E);CHECK,XQ(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(F);
      • Threat
        • QAR(F)+S(B),DCHECK
      • Vars
        • K(a);CHECK,P-FLIGHT,P_SPINQ(b),XP(C)::QAR(F)+S(B)
        • Q(b);CHECK::QAR(F)+S(B),DCHECK
        • Q(b);::S(B)
      • Refutation
        • K(a);CHECK,P_SPINQ(b),S_FLIGHT
    • Try
      • Q(F);P_PINQ(b)
      • Vars
        • Q(b);N_SPINQ(b),XQ(F)::S(B)
        • B(c);N_GUARD::QAR1(F),XQ(b)
      • Refutation
        • K(a);CHECK,P-FLIGHT,XP(C)
  • Actual
    • R(D);
    • Threat
      • R(D)+S(B),DCHECK
    • Vars
      • K(a);CHECK,P-FLIGHT,P_SPINQ(b),XP(C)::R(D)+S(B)
      • K(a);CHECK,P_SPINQ(b),S_FLIGHT::S(B)
      • Q(b);CHECK::R(D)+S(B),DCHECK
      • Q(b);::S(B)
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