MESON Chess Problem Database

Problem Display
PID: 83603 (8/4n3/1Np1p3/4P3/3Pk1K1/1P3R1p/b1p2BQ1/2nq4 w - - 0 1)

Ellerman, Arnoldo

Sports Referee, 1926

8/4n3/1Np1p3/4P3/3Pk1K1/1P3R1p/b1p2BQ1/2nq4

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf3+
      • 2.Qxf3#
    • 1...Qe1
      • 2.Rxh3#
    • 1...Qd2
      • 2.Rxh3#
    • 1...Qd3
      • 2.Rf4#
    • 1...Qxd4
      • 2.Re3#
    • 1...Se2
      • 2.Rxh3#
  • Tries
    • 1.Sd7?
      • threat
        • 2.Sf6#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Kd5
        • 2.Sf6#
      • 1...Qxd4
        • 2.Re3#
        • 2.Rxh3#
      • 1...Sd5
        • 2.Sc5#
      • 1...Sg8!
  • Keys
    • 1.Sa4!
      • threat
        • 2.Sc3#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Kd5
        • 2.Sc3#
      • 1...Qxd4
        • 2.Re3#
      • 1...Qe1
        • 2.Rxh3#
      • 1...Qd2
        • 2.Rxh3#
      • 1...Qd3
        • 2.Rf4#
      • 1...Se2
        • 2.Rxh3#
      • 1...Sd5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,OGATE,P_SPINQ(b),XR(D)::QAB1(B),XQ(b)
    • Q(b);N_PINR(D)::QAB(B)+R(D),XP(e)
    • Q(b);N_PINR(D),SBLOCK::QAB(B)+R(D),DCHECK
    • Q(b);N_PINR(D),SBLOCK,XP(E)::QAB(B)+R(D),DCHECK
    • S(a);N_PINR(D)::QAB(B)+R(D),XP(e)
  • Tries
    • Try
      • S(H);
      • Threat
        • S(H)
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),XR(D)::QAB1(B),XQ(b)
        • K(f);S_FLIGHT::S(H)
        • S(i);SBLOCK::S(H)
      • Refutation
        • S(i);
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),XR(D)::QAB1(B),XQ(b)
      • K(f);S_FLIGHT::S(H)
      • Q(b);N_PINR(D),SBLOCK,XP(E)::QAB(B)+R(D),DCHECK
      • Q(b);N_PINR(D)::QAB(B)+R(D),XP(e)
      • Q(b);N_PINR(D),SBLOCK::QAB(B)+R(D),DCHECK
      • S(a);N_PINR(D)::QAB(B)+R(D),XP(e)
      • S(i);SBLOCK::S(H)
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